Chapter 16 Memory.

In the last chapter what concerned us was the direct intuition of time. We found it limited to intervals¹ of considerably³ less than a minute. Beyond its borders extends the immense region of conceived time, past and future, into one direction or another of which we mentally project all the events which we think of as real, and form a systematic⁴ order of them by giving to each a date. The relation of conceived to intuited time is just like that of the fictitious⁵ space pictured on the flat back-scene of a theatre to the actual space of the stage. The objects painted on the latter (trees, columns, houses in a receding⁶ street, etc.) carry back the series of similar objects solidly placed upon the latter, and we think we see things in a continuous perspective, when we really see thus only a few of them and imagine that we see the rest. The chapter which lies before us deals with the way in which we paint the remote past, as it were, upon a canvas in our memory, and yet often imagine that we have direct vision of its depths.

The stream of thought flows on; but most of its segments fall into the bottomless abyss of oblivion. Of some, no memory survives the instant of their passage. Of others, it is confined to a few moments, hours, or days. Others, again, leave vestiges⁷ which are indestructible, and by means of which they may be recalled as long as life endures. Can we explain these differences?

Primary Memory.

The first point to be noticed is that for a state of mind to survive in memory it must have endured for a certain length of time. In other words, it must be what I call a substantive⁸ state. Prepositional and conjunctival states of mind are not remembered as independent facts -- we cannot recall just how we felt when we said 'how' or 'notwithstanding.' Our consciousness of these transitive states is shut up to their own moment -- hence one difficulty in introspective psychologizing.

Any state of mind which is shut up to its own moment and fails to become an object for succeeding states of mind, is as if it belonged to another stream of thought. Or rather, it belongs only physically¹⁰, not intellectually, to its own stream, forming a bridge from one segment of it to another, but not being appropriated inwardly by later segments or appearing as part of the empirical self, in the manner explained in Chapter X. All the intellectual value for us of a state of mind depends on our after-memory of it. Only then is it combined in a system and knowingly made to contribute to a result. Only then does it count for us. So that the EFFECTIVE consciousness we have of our states is the after-consciousness; and the more of this there is, the more influence does the original state have, and the more permanent a factor is it of our world. An indelibly-imprinted¹¹ pain may color a life; but, as Professor Richet says:

"To suffer for only a hundredth of a second is not to suffer at all; and for my part I would readily agree to undergo a pain, however acute and intense it might be, provided it should last only a hundredth of a second, and leave after it neither reverberation¹² nor recall."¹

Not that a momentary¹³ state of consciousness need be practically resultless. Far from it: such a state, though absolutely unremembered, might at its own moment determine the transition of our thinking in a vital way, and decide our action irrevocably.² But the idea of it could not afterwards determine transition and action, its content could not be conceived as one of the mind's permanent meanings: that is all I mean by saying that its intellectual value lies in after-memory.

As a rule sensations outlast¹⁴ for some little time the objective stimulus¹⁵ which occasioned them. This phenomenon is the ground of those 'after-images' which are familiar in the physiology¹⁶ of the sense-organs. If we open our eyes instantaneously upon a scene, and then shroud¹⁷ them in complete darkness, it will be as if we saw the scene in ghostly light throught [sic] the dark screen. We can read off details in it which were unnoticed whilst the eyes were open.³

In every sphere of sense, an intermittent¹⁸ stimulus, often enough repeated, produces a continuous sensation. This is because the after-image of the impression just gone by blends with the new impression coming in. The effects of stimuli¹⁹ may thus be superposed upon each other many stages deep, the total result in consciousness being an increase in the feeling's intensity²⁰, and in all probability, as we saw in the last chapter, an elementary sense of the lapse²¹ of time (see p. 635).

Exner writes:

"Impressions to which we are inattentive leave so brief an image in the memory that it is usually overlooked. When deeply absorbed, we do not hear the clock strike. But our attention may awake after the striking has ceased, and we may then count off the strokes. Such examples are often found in daily life. We can also prove the existence of this primary memory-image, as it may be called, in another person, even when his attention is completely absorbed elsewhere. Ask someone, e.g., to count the lines of a printed page as fast as he can, and whilst this is going on walk a few steps about the room. Then, when the person has done counting, ask him where you stood. He will always reply quite definitely that you have walked. Analogous²² experiments may be done with vision. This primary memory-image is, whether attention have been turned to the impression or not, an extremely lively one, but is subjectively²³ quite distinct from every sort of after-image or hallucination. . . . It vanishes, if not caught by attention, in the course of a few seconds. Even when the original impression is attended to, the liveliness of its image in memory fades fast."⁴

The physical condition in the nerve-tissue of this primary memory is called by Richet 'elementary memory.'⁵ I much prefer to reserve the word memory for the conscious phenomenon. What happens in the nerve-tissue is but an example of that plasticity or of semi-inertness, yielding to change, but not yielding instantly or wholly, and never quite recovering the original form, which, in Chapter V, we saw to be the groundwork of habit. Elementary habit would be the better name for what Professor Richet means. Well, the first manifestation²⁴ of elementary habit is the slow dying away of an impressed movement on the neural²⁵ matter, and its first effect in consciousness is this so-called elementary memory. But what elementary memory makes us aware of is the just past. The objects we feel in this directly intuited past differ from properly recollected²⁷ objects. An object which is recollected, in the proper sense of that term, is one which has been absent from consciousness altogether, and now revives anew. It is brought back, recalled, fished up, so to speak, from a reservoir in which, with countless²⁸ other objects, it lay buried and lost from view. But an object of primary memory is not thus brought back; it never was lost; its date was never cut off in consciousness from that of the immediately present moment. In fact it comes to us as belonging to the rearward portion of the present space of time, and not to the genuine past. In the last chapter we saw that the portion of time which we directly intuit has a breadth of several seconds, a rearward and a forward end, and may be called the specious³¹ present. All stimuli whose first nerve-vibrations³² have not yet ceased seem to be conditions of our getting this feeling of the specious present. They give rise to objects which appear to the mind as events just past.⁶

When we have been exposed to an unusual stimulus for many minutes or hours, a nervous process is set up which results in the haunting of consciousness by the impression for a long time afterwards. The tactile³⁴ and muscular feelings of a day of skating or riding, after long disuse of the exercise, will come back to us all through the night. Images of the field of view of the microscope will annoy the observer for hours after an unusually long sitting at the instrument. A thread tied around the finger, an unusual constriction³⁵ in the clothing, will feel as if still there, long after they have been removed. These revivals³⁷ (called phenomena³⁸ of Sinnesgedächtniss by the Germans) have something periodical in their nature.⁷ They show that profound rearrangements and slow settlings into a new equilibrium³⁹ are going on in the neural substance, and they form the transition to that more peculiar⁴⁰ and proper phenomenon of memory, of which the rest of this chapter must treat. The first condition which makes a thing susceptible⁴¹ of recall after it has been forgotten is that the original impression of it should have been prolonged enough to give rise to a recurrent image of it, as distinguished⁴² from one of those primary after-images which very fleeting⁴³ impressions may leave behind, and which contain in themselves no guarantee that they will ever come back after having once faded away.⁸ A certain length of stimulation⁴⁴ seems demanded by the inertia⁴⁵ of the nerve-substance. Exposed to a shorter influence, its modification⁴⁶ fails to 'set,' and it retains no effective tendency to fall again into the same form of vibration³³ at which the original feeling was due. This, as I said at the outset, may be the reason why only 'substantive' and not 'transitive' states of mind are as a rule recollected, at least as independent things. The transitive states pass by too quickly.

Analysis of the Phenomenon of Memory.

Memory proper, or secondary memory as it might be styled, is the knowledge of a former state of mind after it has already once dropped from consciousness; or rather it is the knowledge of an event, or fact, of which meantime we have not been thinking, with the additional consciousness that we have thought or experienced it before.

The first element which such a knowledge involves would seem to be the revival³⁶ in the mind of an image or copy of the original event.⁹ And it is an assumption made by many writers¹⁰ that the revival of an image is all that is needed to constitute the memory of the original occurrence. But such a revival is obviously not a memory, whatever else it may be; it is simply a duplicate, a second event, having absolutely no connection with the first event except that it happens to resemble it. The clock strikes to-day; it struck yesterday; and may strike a million times ere it wears out. The rain pours through the gutter⁴⁷ this week; it did so last week; and will do so in sœcula sœculorum. But does the present clock-stroke become aware of the past ones, or the present stream recollect²⁶ the past stream, because they repeat and resemble them? Assuredly not. And let it not be said that this is because clock-strokes and gutters⁴⁸ are physical and not psychical⁴⁹ objects; for psychical objects (sensations for example) simply recurring⁵⁰ in successive editions will remember each other on that account no more than clock-strokes do. No memory is involved in the mere⁵¹ fact of recurrence⁵². The successive editions of a feeling are so many independent events, each snug⁵³ in its own skin. Yesterday's feeling is dead and buried; and the presence of to-day's is no reason why it should resuscitate⁵⁴. A farther condition is required before the present image can be held to stand for a past original.

That condition is that the fact imaged be expressly referred to the past, thought as in the past. But how can we think a thing as in the past, except by thinking of the past together with the thing, and of the relation of the two? And how can we think of the past? In the chapter on Time-perception we have seen that our intuitive or immediate²⁹ consciousness of pastness hardly carries us more than a few seconds backward of the present instant of time. Remoter dates are conceived, not perceived; known symbolically⁵⁵ by names, such as 'last week,' '1850;' or thought of by events which happened in them, as the year in which we attended such a school, or met with such a loss. -- So that if we wish to think of a particular past epoch⁵⁷, we must think of a name or other symbol, or else of certain concrete events, associated therewithal. Both must be thought of, to think the past epoch adequately. And to 'refer' any special fact to the past epoch is to think that fact with the names and events which characterize its date, to think it, in short, with a lot of contiguous associates.

But even this would not be memory. Memory requires more than mere dating of a fact in the past. It must be dated in my past. In other words, I must think that I directly experienced its occurrence. It must have that 'warmth and intimacy⁵⁸' which were so often spoken of in the chapter on the Self, as characterizing all experiences 'appropriated' by the thinker as his own.

A general feeling of the past direction in time, then, a particular date conceived as lying along that direction, and defined by its name or phenomenal contents, an event imagined as located therein, and owned as part of my experience, -- such are the elements of every act of memory.

It follows that what we began by calling the 'image,' or 'copy,' of the fact in the mind, is really not there at all in that simple shape, as a separate 'idea.' Or at least, if it be there as a separate idea, no memory will go with it. What memory goes with is, on the contrary, a very complex representation, that of the fact to be recalled plus its associates, the whole forming one 'object' (as explained on page 275, Chapter IX), known in one integral pulse of consciousness (as set forth⁵⁹ on pp. 276 ff.) and demanding probably a vastly more intricate brain-process than that on which any simple sensorial image depends.

Most psychologists have given a perfectly⁶⁰ clear analysis of the phenomenon we describe. Christian⁶¹ Wolff, for example, writes:

"Suppose you have seen Mevius in the temple, but now afresh in Titus' house. I say you recognize Mevius, that is, are conscious of having seen him before, because, although now you perceive him with your senses along with Titus' house, your imagination produces an image of him along with one of the temple, and of the acts of your own mind reflecting on Mevius in the temple. Hence the idea of Mevius which is reproduced in sense is contained in another series of perceptions than that which formerly⁶² contained it, and this difference is the reason why we are conscious of having had it before . . . . For whilst now you see Mevius in the house of Titus, your imagination places him in the temple, and renders you conscious of the state of mind which you found in yourself when you beheld⁶³ him there. By this you know that you have seen him before, that is, you recognize him. But you recognize him because his idea is now contained in another series of perceptions from that in which you first saw him."¹¹

Similarly James Mill writes:

"In my remembrance of George III., addressing the two houses of parliament, there is, first of all, the mere idea, or simple apprehension⁶⁴, the conception, as it is sometimes called, of the objects. There is combined with this, to make it memory, my idea of my having seen and heard those objects. And this combination is so close that it is not in my power to separate them. I cannot have the idea of George III.; his person and attitude, the paper he held in his hand, the sound of his voice while reading from it; without having the other idea along with it, that of my having been a witness of the scene. . . . If this explanation of the case in which we remember sensations is understood, the explanation of the case in which we remember ideas cannot occasion much of difficulty. I have a lively recollection of Polyphemus's cave, and the actions of Ulysses and the Cyclops, as described by Homer. In this recollection there is, first of all, the ideas, or simple conceptions of the objects and acts; and along with these ideas, and so closely combined as not to be separable, the idea of my having formerly had those same ideas. And this idea of my having formerly had those ideas is a very complicated idea; including the idea of myself of the present moment remembering, and that of myself of the past moment conceiving; and the whole series of the states of consciousness, which intervened between myself remembering, and myself conceiving."¹²

Memory is then the feeling of belief in a peculiar complex object; but all the elements of this object may be known to other states of belief; nor is there in the particular combination of them as they appear in memory anything so peculiar as to lead us to oppose the latter to other sorts of thought as something altogether sui generis, needing a special faculty⁶⁵ to account for it. When later we come to our chapter on Belief we shall see that any represented object which is connected either mediately³⁰ or immediately with our present sensations or emotional activities tends to be believed in as a reality. The sense of a peculiar active relation in it to ourselves is what gives to an object the characteristic quality of reality, and a merely imagined past event differs from a recollected one only in the absence of this peculiar feeling relation. The electric current, so to speak, between it and our present self does not close. But in their other determinations the re-recollected past and the imaginary past may be much the same. In other words, there is nothing unique in the object of memory, and no special faculty is needed to account for its formation. It is a synthesis of parts thought of as related together, perception, imagination, comparison and reasoning being analogous syntheses of parts into complex objects. The objects of any of these faculties⁶⁶ may awaken⁶⁷ belief or fail to awaken it; the object of memory is only an object imagined in the past (usually very completely imagined there) to which the emotion of belief adheres.

Memory's Causes.

Such being the phenomenon of memory, or the analysis of its object, can we see how it comes to pass? can we lay bare its causes?

Its complete exercise presupposes two things:

1) The retention⁶⁸ of the remembered fact;

2) Its reminiscence, recollection, reproduction, or recall.

Now the cause both of retention and of recollection is the law of habit in the nervous system, working as it does in the 'association of ideas.'

Associationists have long explained recollection by association. James Mill gives an account of it which I am unable to improve upon, unless it might be by translating his word 'idea' into 'thing thought of,' or 'object,' as explained so often before.

"There is," he says, "a state of mind familiar to all men, in which we are said to remember. In this state it is certain we have not in the mind the idea which we are trying to have in it.¹³ How is it, then, that we proceed in the course of our endeavor, to procure⁶⁹ its introduction into the mind? If we have not the idea itself, we have certain ideas connected with it. We run over those ideas, one after another, in hopes that some one of them will suggest the idea we are in quest of; and if any one of them does, it is always one so connected with it as to call it up in the way of association. I meet an old acquaintance, whose name I do not remember, and wish to recollect. I run over a number of names, in hopes that some of them may be associated with the idea of the individual. I think of all the circumstances in which I have seen him engaged; the time when I knew him, the persons along with whom I knew him, the things he did, or the things he suffered; and, if I chance upon any idea with which the name is associated, then immediately I have the recollection; if not, my pursuit of it is vain.¹⁴ There is another set of cases, very familiar, but affording very important evidence on the subject. It frequently happens that there are matters which we desire not to forget. What is the contrivance to which we have recourse for preserving the memory -- that is, for making sure that it will be called into existence, when it is our wish that it should? All men invariably employ the same expedient⁷⁰. They endeavor to form an association between the idea of the thing to be remembered, and some sensation, or some idea, which they know beforehand will occur at or near the time when they wish the remembrance to be in their minds. If this association is formed, and the association or idea with which it has been formed occurs; the sensation, or idea, calls up the remembrance; and the object of him who formed the association is attained⁷¹. To use a vulgar instance: a man receives a commission from his friend, and, that he may not forget it, ties a knot in his handkerchief. How is this fact to be explained? First of all, the idea of the commission is associated with the making of the knot. Next, the handkerchief is a thing which it is known beforehand will be frequently seen, and of course at no great distance of time from the occasion on which the memory is desired. The handkerchief being seen, the knot is seen, and this sensation recalls the idea of the commission, between which and itself the association had been purposely formed."¹⁵

In short, we make search in our memory for a forgotten idea, just as we rummage⁷² our house for a lost object. In both cases we visit what seems to us the probable neighborhood of that which we miss. We turn over the things under which, or within which, or alongside of which, it may possibly be; and if it lies near them, it soon comes to view. But these matters, in the case of a mental object sought, are nothing but its associates. The machinery⁷³ of recall is thus the same as the machinery of association, and the machinery of association, as we know, is nothing but the elementary law of habit in the nerve-centres.

And this same law of habit is the machinery of retention also. Retention means liability to recall, and it means nothing more than such liability. The only proof of there being retention is that recall actually takes place. The retention of an experience is, in short, but another name for the possibility of thinking it again, or the tendency to think it again, with its past surroundings. Whatever accidental cue may turn this tendency into an actuality, the permanent ground of the tendency itself lies in the organized neural paths by which the cue calls up the experience on the proper occasion, together with its past associates, the sense that the self was there, the belief that it really happened, etc., etc., just as previously⁷⁴ described. When the recollection is of the 'ready' sort, the resuscitation⁷⁵ takes place the instant the occasion arises; when it is slow, resuscitation comes after delay. But be the recall prompt or slow, the condition which makes it possible at all (or in other words, the 'retention' of the experience) is neither more nor less then the brain-paths which associate the experience with the occasion and cue of the recall. When slumbering⁷⁶, these paths are the condition of retention; when active, they are the condition of recall.

A simple scheme will now make the whole cause of memory plain. Let n be a past event; o its 'setting' (concomitants, date, self present, warmth and intimacy, etc., etc., as already set forth); and m some present thought or fact which may appropriately become the occasion of its recall. Let the nerve-centres, active in the thought of m, n, and o, be represented by M, N, and O, respectively; then the existence of the paths M-N and N-O will be the fact indicated by the phrase 'retention of the event n in the memory,' and the excitement of the brain along these paths will be the condition of the event n's actual recall. The retention of n, it will be observed, is no mysterious storing up of an 'idea' in an unconscious state. It is not a fact of the mental order at all. It is a purely⁷⁷ physical phenomenon, a morphological feature, the presence of these 'paths,' namely, in the finest recesses⁷⁸ of the brain's tissue. The recall or recollection, on the other hand, is a psychophysical phenomenon, with both a bodily and a mental side. The bodily side is the functional⁷⁹ excitement of the tracts⁸⁰ and paths in question; the mental side is the conscious vision of the past occurrence, and the belief that we experienced it before.

These habit-worn paths of association are a clear rendering⁸¹ of what authors mean by 'predispositions,' 'vestiges,' 'traces,' etc., left in the brain by past experience. Most writers leave the nature of these vestiges vague; few think of explicitly⁸³ assimilating them to channels of association. Dr. Maudsley, for example, writes:

"When an idea which we have once had is excited again, there is a reproduction of the same nervous current, with the conscious addition that it is a reproduction -- it is the same idea plus the consciousness that it is the same. The question then suggests itself, What is the physical condition of this consciousness? What is the modification of the anatomical substrata of fibres and cells, or of their physiological⁸⁴ activity, which is the occasion of this plus element in the reproduced idea? It may be supposed that the first activity did leave behind it, when it subsided⁸⁵, some after-effect, some modification of the nerve-element, whereby the nerve-circuit was disposed to fall again readily into the same action; such disposition⁸² appearing in consciousness as recognition or memory. Memory is, in fact, the conscious phase of this physiological disposition when it becomes active or discharges its functions on the recurrence of the particular mental experience. To assist our conception of what may happen, let us suppose the individual nerve-elements to be endowed with their own consciousness, and let us assume them to be, as I have supposed, modified in a certain way by the first experience; it is hard to conceive that when they fall into the same action on another occasion they should not recognize or remember it; for the second action is a reproduction of the first, with the addition of what it contains from the after-effects of the first. As we have assumed the process to be conscious, this reproduction with its addition would be a memory or remembrance."16

In this passage Dr. Maudsley seems to mean by the 'nerve-element,' or 'anatomical substratum of fibres and cells,' something that corresponds to the N of our diagram. And the 'modification' he speaks of seems intended to be understood as an internal modification of this same particular group of elements. Now the slightest reflection will convince anyone that there is no conceivable ground for supposing that with the mere re-excitation of N there should arise the 'conscious addition' that it is a re-excitation. The two excitations are simply two excitations, their consciousnesses are two consciousnesses, they have nothing to do with each other. And a vague 'modification,' supposed to be left behind by the first excitation, helps us not a whit⁸⁶. For, according to all analogy, such a modification can only result in making the next excitation more smooth and rapid. This might make it less conscious, perhaps, but could not endow it with any reference to the past. The gutter is worn deeper by each successive shower, but not for that reason brought into contact with previous showers. Psychology⁸⁷ (which Dr. Maudsley in his next sentence says "affords us not the least help in this matter") puts us on the track of an at least possible brain-explanation. As it is the setting o of the idea, when it recurs⁸⁸, which makes us conscious of it as past, so it can be no intrinsic modification of the 'nerve-element' N which is the organic condition of memory, but something extrinsic⁸⁹ to it altogether, namely, its connections with those other nerve-elements which we called O -- that letter standing⁹ in the scheme for the cerebral⁹⁰ substratum of a great plexus of things other than the principal event remembered, dates, names, concrete surroundings, realized intervals, and what not. The 'modification' is the formation in the plastic nerve-substance of the system of associative paths between N and 0.

The only hypothesis, in short, to which the facts of inward experience give countenance⁹¹ is that the brain-tracts excited by the event proper, and those excited in its recall, are in part different from each other. If we could revive the past event without any associates we should exclude the possibility of memory, and simply dream that we were undergoing the experience as if for the first time.17 Wherever, in fact, the recalled event does appear without a definite setting, it is hard to distinguish it from a mere creation of fancy. But in proportion as its image lingers and recalls associates which gradually become more definite, it grows more and more distinctly into a remembered thing. For example, I enter a friend's room and see on the wall a painting. At first I have the strange, wondering consciousness, 'surely I have seen that before,' but when or how does not become clear. There only clings to the picture a sort of penumbra⁹² of familiarity, -- when suddenly I exclaim: "I have it, it is a copy of part of one of the Fra Angelicos in the Florentine Academy -- I recollect it there!" But the motive⁹³ to the recall does not lie in the fact that the brain-tract now excited by the painting was once before excited in a similar way; it lies simply and solely⁹⁴ in the fact that with that brain-tract other tracts also are excited: those which sustain my friend's room with all its peculiarities⁹⁵, on the one hand; those which sustain the mental image of the Florence Academy, on the other hand, with the circumstances of my visit there; and finally those which make me (more dimly) think of the years I have lived through between these two times. The result of this total brain-disturbance is a thought with a peculiar object, namely, that I who now stand here with this picture before me, stood so many years ago in the Florentine Academy looking at its original.

M. Taine has described the gradual way in which a mental image develops into an object of memory, in his usual vivid fashion. He says:

"I meet casually⁹⁶ in the street a person whose appearance I am acquainted with, and say to myself at once that I have seen him before. Instantly the figure recedes⁹⁷ into the past, and wavers about there vaguely⁹⁸, without at once fixing itself in any spot. It persists in me for some time, and surrounds itself with new details. 'When I saw him he was bare-headed, with a working-jacket on, painting in a studio; he is so-and-so, of such-and-such a street. But when was it? It was not yesterday, nor this week, nor recently. I have it: he told me that he was waiting for the first leaves to come out to go into the country. It was before the spring. But at what exact date? I saw, the same day, people carrying branches in the streets and omnibuses: it was Palm Sunday!' Observe the travels of the internal figure, its various shiftings to front and rear along the line of the past; each of these mental sentences has been a swing of the balance. When confronted with the present sensation and with the latent swarm⁹⁹ of indistinct images which repeat our recent life, the figure first recoiled¹⁰⁰ suddenly to an indeterminate distance. Then, completed by precise details, and confronted with all the shortened images by which we sum up the proceedings¹⁰¹ of a day or a week, it again receded¹⁰² beyond the present day, beyond yesterday, the day before, the week, still farther, beyond the ill-defined mass constituted by our recent recollections. Then something said by the painter was recalled, and it at once receded again beyond an almost precise limit, which is marked by the image of the green leaves and denoted by the word spring. A moment afterwards, thanks to a new detail, the recollection of the branches, it has shifted again, but forward this time, not backward; and, by a reference to the calendar, is situated¹⁰³ at a precise point, a week further back than Easter, and five weeks nearer than the carnival¹⁰⁴, by the double effect of the contrary impulsions, pushing it, one forward and the other backward, and which are, at a particular moment, annulled¹⁰⁵ by one another."18
The Conditions of Goodness in Memory.

The remembered fact being n, then, the path N -- O is what arouses for n its setting when it is recalled, and makes it other than a mere imagination. The path M -- N, on the other hand, gives the cue or occasion of its being recalled at all. Memory being thus altogether conditioned on brain-paths, its excellence¹⁰⁶ in a given individual will depend partly on the number and partly on the persistence¹⁰⁷ of these paths.

The persistence or permanence of the paths is a physiological property of the brain-tissue of the individual, whilst their number is altogether due to the facts of his mental experience. Let the quality of permanence in the paths be called the native tenacity¹⁰⁸, or physiological retentiveness¹¹⁰. This tenacity differs enormously from infancy¹¹¹ to old age, and from one person to another. Some minds are like wax under a seal -- no impression, however disconnected with others, is wiped out. Others, like a jelly, vibrate to every touch, but under usual conditions retain no permanent mark. These latter minds, before they can recollect a fact, must weave it into their permanent stores of knowledge. They have no desultory¹¹² memory. Those persons, on the contrary, who retain names, dates and addresses, anecdotes¹¹³, gossip, poetry, quotations¹¹⁴, and all sorts of miscellaneous facts, without an effort, have desultory memory in a high degree, and certainly owe it to the unusual tenacity of their brain-substance for any path once formed therein. No one probably was ever effective on a voluminous scale without a high degree of this physiological retentiveness. In the practical as in the theoretic life, the man whose acquisitions stick is the man who is always achieving and advancing, whilst his neighbors, spending most of their time in relearning what they once knew but have forgotten, simply hold their own. A Charlemagne, a Luther, a Leibnitz, a Walter Scott, any example, in short, of your quarto or folio editions of mankind, must needs have amazing retentiveness of the purely physiological sort. Men without this retentiveness may excel in the quality of their work at this point or at that, but will never do such mighty¹¹⁵ sums of it, or be influential¹¹⁶ contemporaneously on such a scale.19

But there comes a time of life for all of us when we can do no more than hold our own in the way of acquisitions, when the old paths fade as fast as the new ones form in our brain, and when we forget in a week quite as much as we can learn in the same space of time. This equilibrium may last many, many years. In extreme old age it is upset in the reverse direction, and forgetting prevails over acquisition, or rather there is no acquisition. Brain-paths are so transient that in the course of a few minutes of conversation the same question is asked and its answer forgotten half a dozen times. Then the superior tenacity of the paths formed in childhood becomes manifest: the dotard will retrace¹¹⁷ the facts of his earlier years after he has lost all those of later date.

So much for the permanence of the paths. Now for their number.

It is obvious that the more there are of such paths as M -- N in the brain, and the more of such possible cues or occasions for the recall of n in the mind, the prompter and surer, on the whole, the memory of n will be, the more frequently one will be reminded of it, the more avenues of approach to it one will possess. In mental terms, the more other facts a fact is associated with in the mind, the better possession of it our memory retains. Each of its associates becomes a hook to which it hangs, a means to fish it up by when sunk beneath the surface. Together, they form a network of attachments¹¹⁸ by which it is woven into the entire tissue of our thought. The 'secret of a good memory' is thus the secret of forming diverse and multiple associations with every fact we care to retain. But this forming of associations with a fact, what is it but thinking about the fact as much as possible? Briefly¹¹⁹, then, of two men with the same outward experiences and the same amount of mere native tenacity, the one who THINKS over his experiences most, and weaves them into systematic relations with each other, will be the one with the best memory. We see examples of this on every hand. Most men have a good memory for facts connected with their own pursuits. The college athlete who remains¹²⁰ a dunce at his books will astonish you by his knowledge of men's 'records' in various feats¹²¹ and games, and will be a walking dictionary of sporting statistics. The reason is that he is constantly going over these things in his mind, and comparing and making series of them. They form for him not so many odd facts, but a concept-system -- so they stick. So the merchant remembers prices, the politician other politicians' speeches and votes, with a copiousness¹²² which amazes outsiders, but which the amount of thinking they bestow¹²³ on these subjects easily explains. The great memory for facts which a Darwin and a Spencer reveal in their books is not incompatible¹²⁴ with the possession on their part of a brain with only a middling degree of physiological retentiveness. Let a man early in life set himself the task of verifying such a theory as that of evolution, and facts will soon cluster and cling to him like grapes to their stem. Their relations to the theory will hold them fast; and the more of these the mind is able to discern, the greater the erudition will become. Meanwhile the theorist may have little, if any, desultory memory. Unutilizable facts may be unnoted by him and forgotten as soon as heard. An ignorance almost as encyclopædic as his erudition may coexist with the latter, and hide, as it were, in the interstices of its web. Those who have had much to do with scholars and savants will readily think of examples of the class of mind I mean.

In a system, every fact is connected with every other by some thought-relation. The consequence is that every fact is retained by the combined suggestive power of all the other facts in the system, and forgetfulness is well-nigh impossible.

The reason why cramming¹²⁵ is such a bad mode of study is now made clear. I mean by cramming that way of preparing for examinations by committing 'points' to memory during a few hours or days of intense application immediately preceding the final ordeal¹²⁶, little or no work having been performed during the previous course of the term. Things learned thus in a few hours, on one occasion, for one purpose, cannot possibly have formed many associations with other things in the mind. Their brain-processes are led into by few paths, and are relatively¹²⁷ little liable to be awakened¹²⁸ again. Speedy oblivion is the almost inevitable¹²⁹ fate of all that is committed to memory in this simple way. Whereas, on the contrary, the same materials taken in gradually, day after day, recurring in different contexts, considered in various relations, associated with other external incidents, and repeatedly reflected on, grow into such a system, form such connections with the rest of the mind's fabric¹³⁰, lie open to so many paths of approach, that they remain permanent possessions. This is the intellectual reason why habits of continuous application should be enforced in educational establishments. Of course there is no moral turpitude¹³¹ in cramming. If it led to the desired end of secure learning it would be infinitely¹³² the best method of study. But it does not; and students themselves should understand the reason why.
One's Native Retentiveness is Unchangeable.

It will now appear clear that all improvement of the memory lies in the line of ELABORATING THE ASSOCIATES of each of the several things to be remembered. No amount of culture would seem capable of modifying a man's GENERAL retentiveness. This is a physiological quality, given once for all with his organization, and which he can never hope to change. It differs no doubt in disease and health; and it is a fact of observation that it is better in fresh and vigorous hours than when we are fagged or ill. We may say, then, that a man's native tenacity will fluctuate somewhat with his hygiene¹³⁴, and that whatever is good for his tone of health will also be good for his memory. We may even say that whatever amount of intellectual exercise is bracing¹³⁵ to the general tone and nutrition of the brain will also be profitable to the general retentiveness. But more than this we cannot say; and this, it is obvious, is far less than most people believe.

It is, in fact, commonly thought that certain exercises, systematically¹³⁶ repeated, will strengthen, not only a man's remembrance of the particular facts used in the exercises, but his faculty for remembering facts at large. And a plausible¹³⁷ case is always made out by saying that practice in learning words by heart makes it easier to learn new words in the same way.20 If this be true, then what I have just said is false, and the whole doctrine¹³⁸ of memory as due to 'paths' must be revised. But I am disposed to think the alleged¹³⁹ fact untrue. I have carefully questioned several mature actors on the point, and all have denied that the practice of learning parts has made any such difference as is alleged. What it has done for them is to improve their power of studying a part systematically. Their mind is now full of precedents¹⁴⁰ in the way of intonation¹⁴¹, emphasis, gesticulation; the new words awaken distinct suggestions and decisions; are caught up, in fact, into a pre-existing net-work, like the merchant's prices, or the athlete's store of 'records,' and are recollected easier, although the mere native tenacity is not a whit improved, and is usually, in fact, impaired¹⁴² by age. It is a case of better remembering by better thinking. Similarly when schoolboys improve by practice in ease of learning by heart, the improvement will, I am sure, be always found to reside in the mode of study of the particular piece (due to the greater interest, the greater suggestiveness, the generic¹⁴³ similarity with other pieces, the more sustained attention, etc., etc.), and not at all to any enhancement of the brute¹⁴⁴ retentive¹⁰⁹ power.

The error I speak of pervades¹⁴⁵ an otherwise useful and judicious¹⁴⁶ book, 'How to Strengthen the Memory,' by Dr. Holbrook of New York.21 The author fails to distinguish between the general physiological retentiveness and the retention of particular things, and talks as if both must be benefited by the same means.

"I am now treating," he says, "a case of loss of memory in a person advanced in years, who did not know that his memory had failed most remarkably¹⁴⁷ till I told him of it. He is making vigorous efforts to bring it back again, and with partial success. The method pursued is to spend two hours daily, one in the morning and one in the evening, in exercising this faculty. The patient is instructed to give the closest attention to all that he learns, so that it shall be impressed on his mind clearly. He is asked to recall every evening all the facts and experiences of the day, and again the next morning. Every name heard is written down and impressed on his mind clearly, and an effort made to recall it at intervals. Ten names from among public men are ordered to be committed to memory every week. A verse of poetry is to be learned, also a verse from the Bible, daily. He is asked to remember the number of the page in any book where any interesting fact is recorded. These and other methods are slowly resuscitating¹⁴⁸ a failing memory."22

I find it very hard to believe that the memory of the poor old gentleman is a bit the better for all this torture except in respect of the particular facts thus wrought¹⁴⁹ into it, the occurrences attended to and repeated on those days, the names of those politicians, those Bible verses, etc., etc. In another place Dr. Holbrook quotes the account given by the late Thurlow Weed, journalist and politician, of his method of strengthening his memory.

"My memory was a sieve¹⁵⁰. I could remember nothing. Dates, names, appointments, faces -- everything escaped me. I said to my wife, 'Catherine, I shall never make a successful politician, for I cannot remember, and that is a prime necessity of politicians.' My wife told me I must train my memory. So when I came home that night, I sat down alone and spent fifteen minutes trying silently to recall with accuracy the principal events of the day. I could remember but little at first; now I remember that I could not then recall what I had for breakfast. After a few days' practice I found I could recall more. Events came back to me more minutely, more accurately¹⁵¹, and more vividly¹⁵² than at first. After a fortnight or so of this, Catherine said, 'Why don't you relate to me the events of the day, instead of recalling them to yourself? It would be interesting, and my interest in it would be a stimulus to you.' Having great respect for my wife's opinion, I began a habit of oral confession¹⁵³, as it were, which was continued for almost fifty years. Every night, the last thing before retiring, I told her everything I could remember that had happened to me or about me during the day. I generally recalled the dishes I had had for breakfast, dinner, and tea; the people I had seen and what they had said; the editorials I had written for my paper, giving her a brief abstract of them. I mentioned all the letters I had sent and received, and the very language used, as nearly as possible; when I had walked or ridden -- I told her everything that had come within my observation. I found I could say my lessons better and better every year, and instead of the practice growing irksome, it became a pleasure to go over again the events of the day. I am indebted to this discipline for a memory of somewhat unusual tenacity, and I recommend the practice to all who wish to store up facts, or expect to have much to do with influencing men."23

I do not doubt that Mr. Weed's practical command of his past experiences was much greeter after fifty years of this heroic drill than it would have been without it. Expecting to give his account in the evening, he attended better to each incident of the day, named and conceived it differently, set his mind upon it, and in the evening went over it again. He did more thinking about it, and it stayed with him in consequence. But I venture to affirm pretty confidently (although I know how foolish it often is to deny a fact on the strength of a theory) that the same matter, casually attended to and not thought about, would have stuck in his memory no better at the end than at the beginning of his years of heroic self-discipline. He had acquired a better method of noting and recording¹⁵⁴ his experiences, but his physiological retentiveness was probably not a bit improved.24

All improvement of memory consists, then, in the improvement of one's habitual¹⁵⁵ methods of recording facts. In the traditional terminology¹⁵⁶ methods are divided into the mechanical, the ingenious, and the judicious.

The mechanical methods consist in the intensification¹⁵⁷, prolongation, and repetition of the impression to be remembered. The modern method of teaching children to read by blackboard work, in which each word is impressed by the four-fold channel of eye, ear, voice, and hand, is an example of an improved mechanical method of memorizing.

Judicious methods of remembering things are nothing but logical ways of conceiving them and working them into rational systems, classifying them, analyzing¹⁵⁸ them into parts, etc., etc. All the sciences are such methods.

Of ingenious methods, many have been invented, under the name of technical memories. By means of these systems it is often possible to retain entirely¹⁵⁹ disconnected facts, lists of names, numbers, and so forth, so multitudinous as to be entirely unrememberable in a natural way. The method consists usually in a framework learned mechanically, of which the mind is supposed to remain in secure and permanent possession. Then, whatever is to be remembered is deliberately¹⁶⁰ associated by some fanciful analogy or connection with some part of this framework, and this connection thenceforward helps its recall. The best known and most used of these devices is the figure-alphabet. To remember numbers, e.g., a figure-alphabet is first formed, in which each numerical digit¹⁶¹ is represented by one or more letters. The number is then translated into such letters as will best make a word, if possible a word suggestive of the object to which the number belongs. The word will then be remembered when the numbers alone might be forgotten.

"The most common figure-alphabet is this:

1, 2, 3, 4, 5, 6, 7, 8, 9, 0.

t, n, m, r, l, sh, g, f, b, s,

d, j, k, v, p, c,

ch, c, z,

g, qu.

"To briefly show its use, suppose it is desired to fix 1142 feet in a second as the velocity¹⁶² of sound: t, t, r, n, are the letters and order required. Fill up with vowels¹⁶³ forming a phrase, like 'tight run' and connect it by some such flight of the imagination as that if a man tried to keep up with the velocity of sound, he would have a tight run. When you recall this a few days later great care must be taken not to get confused with the velocity of light, nor to think he had a hard run which would be 3000 feet too fast."25

Dr. Pick and others use a system which consists in linking together any two ideas to be remembered by means of an intermediate idea which will be suggested by the first and suggest the second, and so on through the list.

Thus,

"Let us suppose that we are to retain the following series of ideas: garden, hair, watchman, philosophy, copper¹⁶⁴, etc. . . . We can combine the ideas in this manner: garden, plant, hair of plant -- hair; hair, bonnet¹⁶⁵, watchman; --watchman, wake, study, philosophy; philosophy, chemistry, copper; etc. etc." (Pick.)26

It is matter of popular knowledge that an impression is remembered the better in proportion as it is

1) More recent;

2) More attended to; and

3) More often repeated.

The effect of recency is all but absolutely constant. Of two events of equal significance the remoter one will be the one more likely to be forgotten. The memories of childhood which persist in old age can hardly be compared with the events of the day or hour which are forgotten, for these latter are trivial once-repeated things, whilst the childish reminiscences have been wrought into us during the retrospective hours of our entire intervening life. Other things equal, at all times of life recency promotes memory. The only exception I can think of is the unaccountable memory of certain moments of our childhood, apparently¹⁶⁶ not fitted by their intrinsic interest to survive, but which are perhaps the only incidents we can remember out of the year in which they occurred. Everybody probably has isolated¹⁶⁷ glimpses of certain hours of his nursery life, the position in which he stood or sat, the light of the room, what his father or mother said, etc. These moments so oddly selected for immunity¹⁶⁸ from the tooth of time probably owe their good fortune to historical peculiarities which it is now impossible to trace. Very likely we were reminded of them again soon after they occurred; that became a reason why we should again recollect them, etc., so that at last they became ingrained.

The attention which we lend to an experience is proportional to its vivid or interesting character; and it is a notorious fact that what interests us most vividly at the time is, other things equal, what we remember best. An impression may be so exciting emotionally as almost to leave a scar upon the cerebral tissues; and thus originates a pathological delusion¹⁶⁹. "A woman attacked by robbers takes all the men whom she sees, even her own son, for brigands¹⁷⁰ bent¹⁷¹ on killing¹⁷² her. Another woman sees her child run over by a horse; no amount of reasoning, not even the sight of the living child, will persuade her that he is not killed. A woman called 'thief' in a dispute remains convinced that every one accuses her of stealing (Esquirol). Another, attacked with mania¹⁷³ at the sight of the fires in her street during the Commune, still after six months sees in her delirium¹⁷⁴ flames on every side about her (Luys), etc., etc."27

On the general effectiveness of both attention and repetition I cannot do better than copy what M. Taine has written:

"If we compare different sensations, images, or ideas, we find that their aptitudes¹⁷⁶ for revival are not equal. A large number of them are obliterated¹⁷⁷, and never reappear through life; for instance, I drove through Paris a day or two ago, and though I saw plainly some sixty or eighty new faces, I cannot now recall any one of them; some extraordinary circumstance, a fit of delirium, or the excitement of haschish would be necessary to give them a chance of revival. On the other hand, there are sensations with a force of revival which nothing destroys or decreases. Though, as a rule, time weakens and impairs¹⁷⁸ our strongest sensations, these reappear entire and intense, without having lost a particle of their detail, or any degree of their force. M. Brierre de Boismont, having suffered when a child from a disease of the scalp, asserts that 'after fifty-five years have elapsed he can still feel his hair pulled out under the treatment of the skull-cap.' -- For my own part, after thirty years, I remember feature for feature the appearance of the theatre to which I was taken for the first time. From the third row of boxes, the body of the theatre appeared to me an immense well, red and flaming, swarming¹⁷⁹ with heads; below, on the right, on a narrow floor, two men and a woman entered, went out, and re-entered, made gestures, and seemed to me like lively dwarfs¹⁸⁰: to my great surprise, one of these dwarfs fell on his knees, kissed the lady's hand, then hid behind a screen; the other, who was coming in, seemed angry, and raised his arm. I was then seven, I could understand nothing of what was going on; but the well of crimson¹⁸¹ velvet¹⁸² was so crowded, gilded¹⁸³, and bright, that after a quarter of an hour I was, as it were, intoxicated¹⁸⁴, and fell asleep.

"Every one of us may find similar recollections in his memory, and may distinguish in them a common character. The primitive¹⁸⁵ impression has been accompanied by an extraordinary degree of attention, either as being horrible or delightful¹⁸⁶, or as being new, surprising, and out of proportion to the ordinary run of our life; this it is we express by saying that we have been strongly impressed; that we were absorbed, that we could not think of anything else; that our other sensations were effaced¹⁸⁷; that we were pursued all the next day by the resulting image; that it beset¹⁸⁸ us, that we could not drive it away; that all distractions¹⁸⁹ were feeble beside it. It is by force of this disproportion that impressions of childhood are so persistent¹⁹⁰; the mind being quite fresh, ordinary objects and events are surprising. At present, after seeing so many large halls and full theatres, it is impossible for me, when I enter one, to feel swallowed up, engulfed¹⁹¹, and, as it were, lost in a huge dazzling well. The medical man of sixty, who has experienced much suffering, both personally and in imagination, would be less upset now by a surgical¹⁹² operation than when he was a child.

"Whatever may be the kind of attention, voluntary or involuntary, it always acts alike; the image of an object or event is capable of revival, and of complete revival, in proportion to the degree of attention with which we have considered the object or event. We put this rule in practice at every moment in ordinary life. If we are applying ourselves to a book or are in lively conversation, while an air is being sung in the adjoining room, we do not retain it; we know vaguely that there is singing going on, and that is all. We then stop our reading or conversation, we lay aside all internal preoccupations and external sensations which our mind or the outer world can throw in our way; we close our eyes, we cause a silence within and about us, and, if the air is repeated, we listen. We say then that we have listened with all our ears, that we have applied¹⁹³ our whole minds. If the air is a fine one, and has touched us deeply, we add that we have been transported, uplifted, ravished, that we have forgotten the world and ourselves; that for some minutes our soul was dead to all but sounds . . . .

"This exclusive momentary ascendency of one of our states of mind explains the greater durability¹⁹⁴ of its aptitude¹⁷⁵ for revival and for more complete revival. As the sensation revives in the image, the image reappears with a force proportioned to that of the sensation. What we meet with in the first state is also to be met with in the second, since the second is but a revival of the first. So, in the struggle for life, in which all our images are constantly engaged, the one furnished at the outset with most force retains in each conflict, by the very law of repetition which gives it being, the capacity of treading down its adversaries¹⁹⁵; this is why it revives, incessantly¹⁹⁶ at first, then frequently, until at last the laws of progressive decay, and the continual accession of new impressions bake away its preponderance, and its competitors, finding a clear field, are able to develop in their turn.

"A second cause of prolonged revivals is repetition itself. Every one knows that to learn a thing we must not only consider it attentively¹⁹⁷, but consider it repeatedly. We say as to this in ordinary language, that an impression many times renewed is imprinted more deeply and exactly on the memory. This is how we contrive¹⁹⁸ to retain a language, airs of music, passages of verse or prose, the technical terms and propositions of a science, and still more so the ordinary facts by which our conduct is regulated. When, from the form and color of a currant-jelly, we think of its taste, or, when tasting it with our eyes shut, we magine [sic] its red tint¹⁹⁹ and the brilliancy of a quivering slice, the images in our mind are brightened by repetition. Whenever we eat, or drink, or walk, or avail ourselves of any of our senses, or commence or continue any action whatever, the same thing happens. Every man and every animal thus possesses at every moment of life a certain stock of clear and easily reviving images, which had their source in the past in a confluence²⁰⁰ of numerous experiences, and are now fed by a flow of renewed experiences. When I want to go from the Tuileries to the Panthéon, or from my study to the dining-room, I foresee at every turn the colored forms which will present themselves to my sight; it is otherwise in the case of a house where I have spent two hours, or of a town where I have stayed three days; after ten years have elapsed the images will be vague, full of blanks, sometimes they will not exist, and I shall have to seek my way or shall lose myself. -- This new property of images is also derived²⁰¹ from the first. As every sensation tends to revive in its image, the sensation twice repeated will leave after it a double tendency, that is, provided the attention be as great the second time as the first; usually this is not the case, for, the novelty diminishing, the interest diminishes; but if other circumstances renew the interest, or if the will renovates²⁰² the attention, the incessantly increasing tendency will incessantly increase the chances of the resurrection and integrity of the image."28

If a phenomenon is met with, however, too often, and with too great a variety of contexts, although its image is retained and reproduced with correspondingly great facility, it fails to come up with any one particular setting, and the projection²⁰³ of it backwards²⁰⁴ to a particular past date consequently does not come about. We recognize but do not remember it -- its associates form too confused a cloud. No one is said to remember, says Mr. Spencer,

"that the object at which he looks has an opposite side; or that a certain modification of the visual impression implies a certain distance; or that the thing he sees moving about is a live animal. To ask a man whether he remembers that the sun shines, that fire burns, that iron is hard, would be a misuse²⁰⁵ of language. Even the almost fortuitous connections among our experiences cease to be classed as memories when they have become thoroughly²⁰⁶ familiar. Though, on hearing the voice of some unseen person slightly known to us, we say we recollect to whom the voice belongs, we do not use the same expression respecting the voices of those with whom we live. The meanings of words which in childhood have to be consciously recalled seem in adult life to be immediately present."29

These are cases where too many paths, leading to too diverse associates, block each other's way, and all that the mind gets along with its object is a fringe of felt familiarity or sense that there are associates. A similar result comes about when a definite setting is only nascently aroused. We then feel that we have seen the object already, but when or where we cannot say, though we may seem to ourselves to be on the brink²⁰⁸ of saying it. That nascent²⁰⁷ cerebral excitations can effect consciousness with a sort of sense of the imminence²⁰⁹ of that which stronger excitations would make us definitely feel, is obvious from what happens when we seek to remember a name. It tingles²¹⁰, it trembles on the verge²¹¹, but does not come. Just such a tingling²¹² and trembling of unrecovered associates is the penumbra of recognition that may surround any experience and make it seem familiar, though we know not why.30

There is a curious experience which everyone seems to have had -- the feeling that the present moment in its completeness has been experienced before -- we were saying just this thing, in just this place, to just these people, etc. This 'sense of pre-existence' has been treated as a great mystery and occasioned much speculation²¹³. Dr. Wigan considered it due to a dissociation of the action of the two hemispheres, one of them becoming conscious a little later than the other, but both of the same fact.31 I must confess that the quality of mystery seems to me a little strained. I have over and over again in my own case succeeded in resolving the phenomenon into a case of memory, so indistinct that whilst some past circumstances are presented again, the others are not. The dissimilar portions of the past do not arise completely enough at first for the date to be identified. All we get is the present scene with a general suggestion of pastness about it. That faithful observer, Prof. Lazarus, interprets the phenomenon the same way;32 and it is noteworthy that just as soon as the past context grows complete and distinct the emotion of weirdness²¹⁴ fades from the experience.
Exact Measurements of Memory

have recently been made in Germany. Professor Ebbinghaus, in a really heroic series of daily observations of more than two years' duration, examined the powers of retention and reproduction. He learned lists of meaningless syllables²¹⁵ by heart, and tested his recollection of them from day to day. He could not remember more than 7 after a single reading. It took, however, 16 readings to remember 12, 44 readings to remember 24, and 55 readings to remember 26 syllables, the moment of 'remembering' being here reckoned as the first moment when the list could be recited without a fault.33 When a 16-syllable list was read over a certain number of times on one day, and then studied on the day following until remembered, it was found that the number of seconds saved in the study on the second day was proportional to the number of readings on the first -- proportional, that is, within certain rather narrow limits, for which see the text.34 No amount of repetition spent on nonsense-verses over a certain length enabled Dr. Ebbinghaus to retain them without error for 24 hours. In forgetting such things as these lists of syllables, the loss goes on very much more rapidly at first than later on. He measured the loss by the number of seconds required to relearn the list after it had been once learned. Roughly speaking, if it took a thousand seconds to learn the list, and five hundred to relearn it, the loss between the two learnings would have been one half. Measured in this way, full half of the forgetting seems to occur within the first half-hour, whilst only four fifths is forgotten at the end of a month. The nature of this result might have been anticipated, but hardly its numerical proportions. Dr. Ebbinghaus says:

"The initial rapidity, as well as the final slowness, as these were ascertained²¹⁶ under certain experimental conditions and for a particular individual, . . . may well surprise us. An hour after the work of learning had ceased, forgetting was so far advanced that more than half of the original work had to be applied again before the series of syllables could once more be reproduced. Eight hours later two thirds of the original labor¹³³ had to be applied. Gradually, however, the process of oblivion grew slower, so that even for considerable stretches of time the losses were but barely ascertainable²¹⁷. After 24 hours a third, after 6 days a fourth, and after a whole month a good fifth of the original labor remain in the shape of its after-effects, and made the relearning by so much the more speedy."35

But the most interesting result of all those reached by this author relates to the question whether ideas are recalled only by those that previously came immediately before them, or whether an idea can possibly recall another idea with which it was never in immediate contact, without passing through the intermediate mental links. The question is of theoretic importance with regard to the way in which the process of 'association of ideas' must be conceived; and Dr. Ebbinghaus's attempt is as successful as it is original, in bringing two views, which seem at first sight inaccessible²¹⁸ to proof, to a direct practical test, and giving the victory to one of them. His experiments conclusively²¹⁹ show that an idea is not only 'associated' directly with the one that follows it, and with the rest through that, but that it is directly associated with all that are near it, though in unequal degrees. He first measured the time needed to impress on the memory certain lists of syllables, and then the time needed to impress lists of the same syllables with gaps between them. Thus, representing the syllables by numbers, if the first list were 1, 2, 3, 4, . . . 13, 14, 15, 16, the second would be 1, 3, 5, . . .15, 2, 4, 6, . . .16, and so forth, with many variations.

Now, if 1 and 3 in the first list were learned in that order merely by 1 calling up 2, and by 2 calling up 3, leaving out the 2 ought to leave 1 and 3 with no tie in the mind; and the second list ought to take as much time in the learning as if the first list had never been heard of. If, on the other hand, 1 has a direct influence on 3 as well as on 2, that influence should be exerted even when 2 is dropped out; and a person familiar with the first list ought to learn the second one more rapidly than otherwise he could. This latter case is what actually occurs; and Dr. Ebbinghaus has found that syllables originally separated by as many as seven intermediaries still reveal, by the increased rapidity with which they are learned in order, the strength of the tie that the original learning established between them, over the heads, so to speak, of all the rest. These last results ought to make us careful, when we speak of nervous 'paths,' to use the word in no restricted sense. They add one more fact to the set of facts which prove that association is subtler than consciousness, and that a nerve-process may, without producing consciousness, be effective in the same way in which consciousness would have seemed to be effective if it had been there.36 Evidently the path from 1
to 3 (omitting 2 from consciousness) is facilitated, broadened perhaps, by the old path from 1 to 3 through 2 -- only the component²²⁰ which shoots round through this latter way is too feeble to let 2 be thought as a distinct object.

Mr. Wolfe, in his experiments on recognition, used vibrating metal tongues.

"These tongues gave tones differing by 2 vibrations only in the two lower octaves, and by 4 vibrations in the three higher octaves. In the first series of experiments a tone was selected, and, after sounding it for one second, a second tone was sounded, which was either the same as the first, or different from it by 4, 8, or 12 vibrations in different series. The person experimented upon was to answer whether the second tone was the same as the first, thus showing that he recognized it, or whether it was different, and, if so, whether it was higher or lower. Of course, the interval² of time between the two tones was an important factor. The proportionate number of correct judgments²²¹, and the smallness of the difference of the vibration-rates of the two tones, would measure the accuracy of the tone-memory. It appeared that one could tell more readily when the two tones were alike than when they were different, although in both cases the accuracy of the memory was remarkably good. . . . The main point is the effect of the time-interval between the tone and its reproduction. This was varied²²² from 1 second to 30 seconds, or even to 60 seconds or 120 seconds in some experiments. The general result is, that the longer the interval, the smaller are the chances that the tone will be recognized; and this process of forgetting takes place at first very rapidly, and then more slowly. . . . This law is subject to considerable variations, one of which seems to be constant and is peculiar; namely, there seems to be a rhythm in the memory itself, which, after falling, recovers slightly, and then fades out again."37

This periodical renewal²²³ of acoustic²²⁴ memory would seem to be an important element in the production of the agreeableness of certain rates of recurrence in sound.
Forgetting.

In the practical use of our intellect, forgetting is as important a function as recollecting²²⁵.

Locke says, in a memorable²²⁶ page of his dear old book:

"The memory of some men, it is true, is very tenacious²²⁷, even to a miracle; but yet there seems to be a constant decay of all our ideas, even of those which are struck deepest, and in minds the most retentive; so that if they be not sometimes renewed by repeated exercise of the senses, or reflection on those kinds of objects which at first occasioned them, the print wears out, and at last there remains nothing to be seen. Thus the ideas, as well as children, of our youth, often die before us; and our minds represent to us those tombs to which we are fast approaching; where, though the brass²²⁸ and marble remain, yet the inscriptions²²⁹ are effaced by time, and the imagery moulders²³⁰ away. The pictures drawn²³¹ in our minds are laid in fading colors; and, if not sometimes refreshed, vanish and disappear. How much the constitution of our bodies, and the make of our animal spirits, are concerned in this; and whether the temper of the brain makes this difference, that in some it retains the characters drawn on it like marble, in others like freestone, and in others little better than sand, I shall not here inquire, though it may seem probable that the constitution of the body does sometimes influence the memory; since we oftentimes find a disease quite strip the mind of all its ideas, and the flames of a fever in a few days calcine all those images to dust and confusion, which seemed to be as lasting²³² as if graven in marble."38

This peculiar mixture of forgetting with our remembering is but one instance of our mind's selective activity. Selection is the very keel on which our mental ship is built. And in this case of memory its utility is obvious. If we remembered everything, we should on most occasions be as ill off as if we remembered nothing. It would take as long for us to recall a space of time as it took the original time to elapse, and we should never get ahead with our thinking. All recollected times undergo, accordingly, what M. Ribot calls foreshortening; and this foreshortening is due to the omission²³³ of an enormous number of the facts which filled them.

"As fast as the present enters into the past, our states of consciousness disappear and are obliterated. Passed in review at a few days' distance, nothing or little of them remains: most of them have made shipwreck²³⁴ in that great nonentity²³⁵ from which they never more will emerge, and they have carried with them the quantity of duration which was inherent in their being. This deficit²³⁶ of surviving conscious states is thus a deficit in the amount of represented time. The process of abridgment²³⁷, of foreshortening, of which we have spoken, presupposes this deficit. If, in order to reach a distant reminiscence, we had to go through the entire series of terms which separate it from our present selves, memory would become impossible on account of the length of the operation. We thus reach the paradoxical result that one condition of remembering is that we should forget. Without totally forgetting a prodigious²³⁸ number of states of consciousness, and momentarily forgetting a large number, we could not remember at all. Oblivion, except in certain cases, is thus no malady²³⁹ of memory, but a condition of its health and its life."39

There are many irregularities in the process of forgetting which are as yet unaccounted for. A thing forgotten on one day will be remembered on the next. Something we have made the most strenuous²⁴⁰ efforts to recall, but all in vain, will, soon after we have given up the attempt, saunter into the mind, as Emerson somewhere says, as innocently as if it had never been sent for. Experiences of bygone date will revive after years of absolute oblivion, often as the result of some cerebral disease or accident which seems to develop latent paths of association, as the photographer's fluid develops the picture sleeping in the collodion film. The oftenest quoted of these cases is Coleridge's:

"In a Roman Catholic town in Germany, a young woman, who could neither read nor write, was seized with a fever, and was said by the priests to be possessed²⁴¹ of a devil, because she was heard talking Latin, Greek, and Hebrew. Whole sheets of her ravings were written out, and found to consist of sentences intelligible²⁴² in themselves, but having slight connection with each other. Of her Hebrew sayings, only a few could be traced to the Bible, and most seemed to be in the Rabbinical dialect. All trick was out of the question; the woman was a simple creature; there was no doubt as to the fever. It was long before any explanation, save that of demoniacal possession, could be obtained. At last the mystery was unveiled by a physician, who determined²⁴³ to trace back the girl's history, and who, after much trouble, discovered that at the age of nine she had been charitably taken by an old Protestant pastor²⁴⁴, a great Hebrew scholar, in whose house she lived till his death. On further inquiry²⁴⁵ it appeared to have been the old man's custom for years to walk up and down a passage of his house into which the kitchen opened, and to read to himself with a loud voice out of his books. The books were ransacked²⁴⁶, and among them were found several of the Greek and Latin Fathers, together with a collection of Rabbinical writings. In these works so many of the passages taken down at the young woman's bedside were identified that there could be no reasonable doubt as to their source."40

Hypnotic subjects as a rule forget all that has happened in their trance. But in a succeeding trance they will often remember the events of a past one. This is like what happens in those cases of 'double personality' in which no recollection of one of the lives is to be found in the other. We have already seen in an earlier chapter that the sensibility often differs from one of the alternate personalities²⁴⁷ to another, and we have heard M. Pierre Janet's theory that anæsthesias carry amnesias with them (see above, pp. 385 ff.). In certain cases this is evidently so; the throwing of certain functional brain-tracts out of gear with others, so as to dissociate their consciousness from that of the remaining brain, throws them out for both sensorial and ideational service. M. Janet proved in various ways that what his patients forgot when anæsthetic they remembered when the sensibility returned. For instance, he restored their tactile sense temporarily by means of electric currents, passes, etc., and then made them handle various objects, such as keys and pencils, or make particular movements, like the sign of the cross. The moment the anæsthesia returned they found it impossible to recollect the objects or the acts. 'They had had nothing in their hands, they had done nothing,' etc. The next day, however, sensibility being again restored by similar processes, they remembered perfectly the circumstance, and told what they had handled or had done.

All these pathological facts are showing us that the sphere of possible recollection may be wider than we think, and that in certain matters apparent oblivion is no proof against possible recall under other conditions. They give no countenance, however, to the extravagant²⁴⁸ opinion that nothing we experience can be absolutely forgotten. In real life, in spite of occasional surprises, most of what happens actually is forgotten. The only reasons for supposing that if the conditions were forthcoming everything would revive are of a transcendental sort. Sir Wm. Hamilton quotes and adopts them from the German writer Schmid. Knowledge being a 'spontaneous self-energy' on the part of the mind,

"this energy being once determined, it is natural that it should persist, until again annihilated²⁴⁹ by other causes. This [annihilation] would be the case, were the mind merely passive. . . . But the mental activity, the act of knowledge, of which I now speak, is more than this; it is an energy of the self-active power of a subject one and indivisible: consequently a part of the ego²⁵⁰ must be detached or annihilated, if a cognition once existent be again extinguished. Hence it is that the problem most difficult of solution is not, how a mental activity endures, but how it ever vanishes."41

Those whom such an argument persuades may be left happy with their belief. Other positive argument there is none, none certainly of a physiological sort.42

When memory begins to decay, proper names are what go first, and at all times proper names are harder to recollect than those of general properties and classes of things.

This seems due to the fact that common qualities and names have contracted an infinitely greater number of associations in our mind than the names of most of the persons whom we know. Their memory is better organized. Proper names as well organized as those of our family and friends are recollected as well as those of any other objects.43 'Organization' means numerous associations; and the more numerous the associations, the greater the number of paths of recall. For the same reason adjectives, conjunctions, prepositions, and the cardinal²⁵¹ verbs, those words, in short, which form the grammatical framework of all our speech, are the very last to decay. Kussmaul44 makes the following acute remark on this subject:

"The concreter a conception is, the sooner is its name forgotten. This is because our ideas of persons and things are less strongly bound up with their names than with such abstractions as their business, their circumstances, their qualities. We easily can imagine persons and things without their names, the sensorial image of them being more important than that other symbolic⁵⁶ image, their name. Abstract conceptions, on the other hand, are only acquired by means of the words which alone serve to confer stability upon them. This is why verbs, adjectives, pronouns, and still more adverbs, prepositions, and conjunctions are more intimately connected with our thinking than are substantives²⁵²."

The disease called Aphasia²⁵³, of which a little was said in Chapter II, has let in a flood of light on the phenomenon of Memory, by showing the number of ways in which the use of a given object, like a word, may be lost by the mind. We may lose our acoustic idea or our articulatory idea of it; neither without the other will give up proper command of the word. And if we have both, but have lost the paths of association between the brain-centres which support the two, we are in as bad a plight²⁵⁴. 'Ataxic' and 'amnesic²⁵⁵' aphasia, 'word-deafness,' and 'associative aphasia' are all practical losses of word-memory. We have thus, as M. Ribot says, not memory so much as memories.45 The visual, the tactile, the muscular, the auditory memory may all vary independently of each other in the same individual; and different individuals may have them developed in different degrees. As a rule, a man's memory is good in the departments in which his interest is strong; but those departments are apt to be those in which his discriminative²⁵⁶ sensibility is high. A man with a bad ear is not likely to have practically a good musical memory, or a purblind²⁵⁷ person to remember visual appearance well. In a later chapter we shall see illustrations of the differences in men's imagining power.46 It is obvious that the machinery of memory must be largely determined thereby²⁵⁸.

Mr. Galton, in his work on English Men of Science,47 has given a very interesting collation²⁵⁹ of cases showing individual variations in the type of memory, where it is strong. Some have it verbal. Others have it good for facts and figures, others for form. Most say that what is to be remembered must first be rationally conceived and assimilated.48

There is an interesting fact connected with remembering, which, so far as I know, Mr. R. Verdon was the first writer expressly to call attention to. We can set our memory as it were to retain things for a certain time, and then let them depart.

"Individuals often remember clearly and well up to the time when they have to use their knowledge, and then, when it is no longer required, there follows a rapid and extensive decay of the traces. Many schoolboys forgot their lessons after they have said them, many barristers forgot details got up for a particular case. Thus a boy learns thirty lines of Homer, says them perfectly, and then forgets them so that he could not say five consecutive²⁶⁰ lines the next morning, and a barrister may be one week learned in the mysteries of making cog-wheels, but in the next he may be well acquainted with the anatomy²⁶¹ of the ribs²⁶² instead."49

The rationale of this fact is obscure; and the existence of it ought to make us feel how truly subtle are the nervous processes which memory involves. Mr. Verdon adds that

"When the use of a record is withdrawn²⁶³, and attention withdrawn from it, and we think no more about it, we know that we experience a feeling of relief, and we may thus conclude that energy is in some way liberated²⁶⁴. If the . . . attention is not withdrawn, so that we keep the record in mind, we know that this feeling of relief does not take place. . . . Also we are well aware, not only that after this feeling of relief takes place, the record does not seem so well conserved²⁶⁵ as before, but that we have real difficulty in attempting to remember it."

This shows that we are not as entirely unconscious of a topic as we think, during the time in which we seem to be merely retaining it subject to recall.

"Practically," says Mr. Verdon, "we sometimes keep a matter in hand not exactly by attending to it, but by keeping our attention referred to something connected with it from time to time. Translating this into the language of physiology, we mean that by referring attention to a part within, or closely connected with, the system of traces [paths] required to be remembered, we keep it well fed, so that the traces are preserved with the utmost delicacy²⁶⁶."

This is perhaps as near as we can get to an explanation. Setting the mind to remember a thing involves a continual minimal²⁶⁷ irradiation of excitement into paths which lead thereto, involves the continued presence of the thing in the 'fringe' of our consciousness. Letting the thing go involves withdrawal²⁶⁸ of the irradiation, unconsciousness of the thing, and, after a time, obliteration²⁶⁹ of the paths.

A curious peculiarity²⁷⁰ of our memory is that things are impressed better by active than by passive repetition. I mean that in learning by heart (for example), when we almost know the piece, it pays better to wait and recollect by an effort from within, then to look at the book again. If we recover the words in the former way, we shall probably know them the next time; if in the latter way, we shall very likely need the book once more. The learning by heart means the formation of paths from a former set to a later set of cerebral word-processes: call 1 and 2 in the diagram the processes in question; then when we remember by inward effort, the path is formed by discharge from 1 to 2, just as it will afterwards be used. But when we excite 2 by the eye, although the path 1 -- 2 doubtless is then shot through also, the phenomenon which we are discussing shows that the direct discharge from 1 into 2, unaided by the eyes, ploughs the deeper and more permanent groove²⁷¹. There is, moreover, a greater amount of tension accumulated in the brain before the discharge from 1 to 2, when the latter takes place unaided by the eye. This is proved by the general feeling of strain in the effort to remember 2; and this also ought to make the discharge more violent and the path more deep. A similar reason doubtless accounts for the familiar fact that we remember our own theories, our own discoveries, combinations, inventions, in short whatever 'ideas' originate in our own brain, a thousand times better than exactly similar things which are communicated to us from without.

A word, in closing, about the metaphysics involved in remembering. According to the assumptions of this book, thoughts accompany the brain's workings, and those thoughts are cognitive²⁷² of realities. The whole relation is one which we can only write down empirically, confessing that no glimmer²⁷³ of explanation of it is yet in sight. That brains should give rise to a knowing consciousness at all, this is the one mystery which returns, no matter of what sort the consciousness and of what sort the knowledge may be. Sensations, aware of mere qualities, involve the mystery as much as thoughts, aware of complex systems, involve it. To the platonizing tradition in philosophy, however, this is not so. Sensational²⁷⁴ consciousness is something quasi-material, hardly cognitive, which one need not much wonder at. Relating consciousness is quite the reverse, and the mystery of it is unspeakable. Professor Ladd, for example, in his usually excellent book,50 after well showing the matter-of-fact dependence²⁷⁵ of retention and reproduction on brain-paths, says:

"In the study of perception psycho-physics can do much towards a scientific explanation. It can tell what qualities of stimuli produce certain qualities of sensations; it can suggest a principle relating the quantity of the stimuli to the intensity of the sensation; it can investigate the laws under which, by combined action of various excitations, the sensations are combined [?] into presentations of sense; it can show how the time-relations of the sensations and percepts in consciousness correspond to the objective relations in time of the stimulations. But for that spiritual activity which actually puts together in consciousness the sensations, it cannot even suggest the beginning of a physical explanation. Moreover, no cerebral process can be conceived of, which -- in case it were known to exist -- could possibly be regarded as a fitting basis for this unifying²⁷⁶ actus of mind. Thus also, and even more emphatically, must we insist upon the complete inability of physiology to suggest an explanation for conscious memory, in so far as it is memory -- that is, in so far as it most imperatively²⁷⁷ calls for explanation. . . . The very essence of the act of memory consists in the ability to say: This after-image is the image of a percept I had a moment since; or this image of memory is the image of the percept I had at a certain time -- I do not remember precisely²⁷⁸ how long since. It would, then, be quite contrary to the facts to hold that, when an image of memory appears in consciousness, it is recognized as belonging to a particular original percept on account of its perceived resemblance to this percept. The original percept does not exist and will never be reproduced. Even more palpably false and absurd would it be to hold that any similarity of the impressions or processes in end organs or central organs explains the act of conscious memory. Consciousness knows nothing of such similarity; knows nothing even of the existence of nervous impressions and processes. Moreover, we could never know two impressions or processes that are separated in time to be similar, without involving the same inexplicable²⁷⁹ act of memory. It is a fact of consciousness on which all possibility of connected experience and of recorded and cumulative²⁸⁰ human knowledge is dependent that certain phases or products of consciousness appear with a claim to stand for (to represent)51 past experiences to which they are regarded as in some respect similar. It is this peculiar claim in consciousness which constitutes the essence of an act of memory; it is this which makes the memory wholly inexplicable as a mere persistence or recurrence of similar impressions. It is this which makes conscious memory a spiritual phenomenon, the explanation of which, as arising out of nervous processes and conditions, is not simply undiscovered in fact, but utterly²⁸¹ incapable²⁸² of approach by the imagination. When, then, we speak of a physical basis of memory, recognition must be made of the complete inability of science to suggest any physical process which can be conceived of as correlated with that peculiar and mysterious actus of the mind, connecting its present and its past, which constitutes the essence of memory."

This passage seems to me characteristic of the reigning²⁸³ half-way modes of thought. It puts the difficulties in the wrong places. At one moment it seems to admit with the cruder sensationalists that the material of our thoughts is independent sensations reproduced, and that the 'putting together' of these sensations would be knowledge, if it could only be brought about, the only mystery being as to the what 'actus' can bring it about. At another moment it seems to contend that even this sort of 'combining' would not be knowledge, because certain of the elements connected must 'claim to represent or stand for' past originals, which is incompatible with their being mere images revived. The result is various confused and scattered²⁸⁴ mysteries and unsatisfied intellectual desires. But why not 'pool' our mysteries into one great mystery, the mystery that brain-processes occasion knowledge at all? It is surely no different mystery to feel myself by means of one brain-process writing at this table now, and by means of a different brain-process a year hence to remember myself writing. All that psychology can do is to seek to determine what the several brain-processes are; and this, in a wretchedly imperfect way, is what such writings as the present chapter have begun to do. But of 'images reproduced,' and 'claiming to represent,' and 'put together by a unifying actus,' I have been silent, because such expressions either signify nothing, or they are only roundabout ways of simply saying that the past is known when certain brain-conditions are fulfilled, and it seems to me that the straightest and shortest way of saying that is the best.

For a history of opinion about Memory, and other bibliographic²⁸⁵ references, I must refer to the admirable little monograph²⁸⁶ on the subject by Mr. W. H. Burnham in the American Journal of Psychology, vols. I and II. Useful books are: D. Kay's Memory, What It Is, and How to Improve It (1888); and F. Fauth's Das Gedächtniss, Studie zu einer Pädagogik, etc., 1888.

 

1 intervals   

n.[军事]间隔( interval的名词复数 )；间隔时间；[数学]区间；（戏剧、电影或音乐会的）幕间休息

参考例句：

• The forecast said there would be sunny intervals and showers. 预报间晴，有阵雨。
• Meetings take place at fortnightly intervals. 每两周开一次会。

2 interval   

n.间隔，间距；幕间休息，中场休息

参考例句：

• The interval between the two trees measures 40 feet.这两棵树的间隔是40英尺。
• There was a long interval before he anwsered the telephone.隔了好久他才回了电话。

3 considerably   

adv.极大地；相当大地；在很大程度上

参考例句：

• The economic situation has changed considerably.经济形势已发生了相当大的变化。
• The gap has narrowed considerably.分歧大大缩小了。

4 systematic   

adj.有系统的，有计划的，有方法的

参考例句：

• The way he works isn't very systematic.他的工作不是很有条理。
• The teacher made a systematic work of teaching.这个教师进行系统的教学工作。

5 fictitious   

adj.虚构的，假设的；空头的

参考例句：

• She invented a fictitious boyfriend to put him off.她虚构出一个男朋友来拒绝他。
• The story my mother told me when I was young is fictitious.小时候妈妈对我讲的那个故事是虚构的。

6 receding   

v.逐渐远离( recede的现在分词 )；向后倾斜；自原处后退或避开别人的注视；尤指问题

参考例句：

• Desperately he struck out after the receding lights of the yacht. 游艇的灯光渐去渐远，他拼命划水追赶。 来自辞典例句
• Sounds produced by vehicles receding from us seem lower-pitched than usual. 渐渐远离我们的运载工具发出的声似乎比平常的音调低。 来自辞典例句

7 vestiges   

残余部分( vestige的名词复数 )； 遗迹； 痕迹； 毫不

参考例句：

• the last vestiges of the old colonial regime 旧殖民制度最后的残余
• These upright stones are the vestiges of some ancient religion. 这些竖立的石头是某种古代宗教的遗迹。

8 substantive   

adj.表示实在的；本质的、实质性的；独立的；n.实词，实名词；独立存在的实体

参考例句：

• They plan to meet again in Rome very soon to begin substantive negotiations.他们计划不久在罗马再次会晤以开始实质性的谈判。
• A president needs substantive advice,but he also requires emotional succor. 一个总统需要实质性的建议，但也需要感情上的支持。

9 standing   

n.持续，地位；adj.永久的，不动的，直立的，不流动的

参考例句：

• After the earthquake only a few houses were left standing.地震过后只有几幢房屋还立着。
• They're standing out against any change in the law.他们坚决反对对法律做任何修改。

10 physically   

adj.物质上，体格上，身体上，按自然规律

参考例句：

• He was out of sorts physically,as well as disordered mentally.他浑身不舒服，心绪也很乱。
• Every time I think about it I feel physically sick.一想起那件事我就感到极恶心。

11 imprinted   

v.盖印（imprint的过去式与过去分词形式）

参考例句：

• The terrible scenes were indelibly imprinted on his mind. 那些恐怖场面深深地铭刻在他的心中。
• The scene was imprinted on my mind. 那个场面铭刻在我的心中。 来自《简明英汉词典》

12 reverberation   

反响； 回响； 反射； 反射物

参考例句：

• It was green as an emerald, and the reverberation was stunning. 它就象翠玉一样碧绿，回响震耳欲聋。
• Just before dawn he was assisted in waking by the abnormal reverberation of familiar music. 在天将破晓的时候，他被一阵熟悉的，然而却又是反常的回声惊醒了。

13 momentary   

adj.片刻的，瞬息的；短暂的

参考例句：

• We are in momentary expectation of the arrival of you.我们无时无刻不在盼望你的到来。
• I caught a momentary glimpse of them.我瞥了他们一眼。

14 outlast   

v.较…耐久

参考例句：

• The great use of life is to spend it doing something that will outlast it.人生的充分利用就是为争取比人生更长久的东西而度过一生。
• These naturally dried flowers will outlast a bouquet of fresh blooms.这些自然风干的花会比一束鲜花更加持久。

15 stimulus   

n.刺激，刺激物，促进因素，引起兴奋的事物

参考例句：

• Regard each failure as a stimulus to further efforts.把每次失利看成对进一步努力的激励。
• Light is a stimulus to growth in plants.光是促进植物生长的一个因素。

16 physiology   

n.生理学，生理机能

参考例句：

• He bought a book about physiology.他买了一本生理学方面的书。
• He was awarded the Nobel Prize for achievements in physiology.他因生理学方面的建树而被授予诺贝尔奖。

17 shroud   

n.裹尸布，寿衣；罩，幕；vt.覆盖，隐藏

参考例句：

• His past was enveloped in a shroud of mystery.他的过去被裹上一层神秘色彩。
• How can I do under shroud of a dark sky?在黑暗的天空的笼罩下，我该怎么做呢？

18 intermittent   

adj.间歇的，断断续续的

参考例句：

• Did you hear the intermittent sound outside?你听见外面时断时续的声音了吗？
• In the daytime intermittent rains freshened all the earth.白天里，时断时续地下着雨，使整个大地都生气勃勃了。

19 stimuli   

n.刺激（物）

参考例句：

• It is necessary to curtail or alter normally coexisting stimuli.必需消除或改变正常时并存的刺激。
• My sweat glands also respond to emotional stimuli.我的汗腺对情绪刺激也能产生反应。

20 intensity   

n.强烈，剧烈；强度；烈度

参考例句：

• I didn't realize the intensity of people's feelings on this issue.我没有意识到这一问题能引起群情激奋。
• The strike is growing in intensity.罢工日益加剧。

21 lapse   

n.过失，流逝，失效，抛弃信仰，间隔；vi.堕落，停止，失效，流逝；vt.使失效

参考例句：

• The incident was being seen as a serious security lapse.这一事故被看作是一次严重的安全疏忽。
• I had a lapse of memory.我记错了。

22 analogous   

adj.相似的；类似的

参考例句：

• The two situations are roughly analogous.两种情況大致相似。
• The company is in a position closely analogous to that of its main rival.该公司与主要竞争对手的处境极为相似。

23 subjectively   

主观地； 臆

参考例句：

• Subjectively, the demand of interest is the desire of human being. 荀子所说的对利的需要从主观上说就是人的欲望。
• A sound also has an amplitude, a property subjectively heard as loudness. 声音有振幅，振幅的主观感觉是声音的大小。

24 manifestation   

n.表现形式；表明；现象

参考例句：

• Her smile is a manifestation of joy.她的微笑是她快乐的表现。
• What we call mass is only another manifestation of energy.我们称之为质量的东西只是能量的另一种表现形态。

25 neural   

adj.神经的，神经系统的

参考例句：

• The neural network can preferably solve the non- linear problem.利用神经网络建模可以较好地解决非线性问题。
• The information transmission in neural system depends on neurotransmitters.信息传递的神经途径有赖于神经递质。

26 recollect   

v.回忆，想起，记起，忆起，记得

参考例句：

• He tried to recollect things and drown himself in them.他极力回想过去的事情而沉浸于回忆之中。
• She could not recollect being there.她回想不起曾经到过那儿。

27 recollected   

adj.冷静的；镇定的；被回忆起的；沉思默想的v.记起，想起( recollect的过去式和过去分词 )

参考例句：

• I recollected that she had red hair. 我记得她有一头红发。 来自《简明英汉词典》
• His efforts, the Duke recollected many years later, were distinctly half-hearted. 据公爵许多年之后的回忆，他当时明显只是敷衍了事。 来自辞典例句

28 countless   

adj.无数的，多得不计其数的

参考例句：

• In the war countless innocent people lost their lives.在这场战争中无数无辜的人丧失了性命。
• I've told you countless times.我已经告诉你无数遍了。

29 immediate   

adj.立即的；直接的，最接近的；紧靠的

参考例句：

• His immediate neighbours felt it their duty to call.他的近邻认为他们有责任去拜访。
• We declared ourselves for the immediate convocation of the meeting.我们主张立即召开这个会议。

30 mediately   

在中间，间接

参考例句：

• Im-mediately after a race, each swimmer has an ear pricked to test for lac-tic-acid levels. 赛后每个泳者耳朵立刻用针扎一下，验血浆乳酸浓度值。

31 specious   

adj.似是而非的；adv.似是而非地

参考例句：

• Such talk is actually specious and groundless.这些话实际上毫无根据，似是而非的。
• It is unlikely that the Duke was convinced by such specious arguments.公爵不太可能相信这种似是而非的论点。

32 vibrations   

n.摆动( vibration的名词复数 )；震动；感受；（偏离平衡位置的）一次性往复振动

参考例句：

• We could feel the vibrations from the trucks passing outside. 我们可以感到外面卡车经过时的颤动。
• I am drawn to that girl; I get good vibrations from her. 我被那女孩吸引住了，她使我产生良好的感觉。 来自《简明英汉词典》

33 vibration   

n.颤动，振动；摆动

参考例句：

• There is so much vibration on a ship that one cannot write.船上的震动大得使人无法书写。
• The vibration of the window woke me up.窗子的震动把我惊醒了。

34 tactile   

adj.触觉的，有触觉的，能触知的

参考例句：

• Norris is an expert in the tactile and the tangible.诺里斯创作最精到之处便是，他描绘的人物使人看得见摸得着。
• Tactile communication uses touch rather than sight or hearing.触觉交流，是用触摸感觉，而不是用看或听来感觉。

35 constriction   

压缩； 紧压的感觉； 束紧； 压缩物

参考例句：

• She feels a constriction in the chest. 她胸部有压迫感。
• If you strain to run fast, you start coughing and feel a constriction in the chest. 还是别跑紧了，一咬牙就咳嗽，心口窝辣蒿蒿的！ 来自汉英文学 - 骆驼祥子

36 revival   

n.复兴，复苏，（精力、活力等的）重振

参考例句：

• The period saw a great revival in the wine trade.这一时期葡萄酒业出现了很大的复苏。
• He claimed the housing market was showing signs of a revival.他指出房地产市场正出现复苏的迹象。

37 revivals   

n.复活( revival的名词复数 )；再生；复兴；（老戏多年后）重新上演

参考例句：

• She adored parades, lectures, conventions, camp meetings, church revivals-in fact every kind of dissipation. 她最喜欢什么游行啦、演讲啦、开大会啦、营火会啦、福音布道会啦--实际上各种各样的娱乐。 来自辞典例句
• The history of art is the history of revivals. 艺术的历史就是复兴的历史。 来自互联网

38 phenomena   

n.现象

参考例句：

• Ade couldn't relate the phenomena with any theory he knew.艾德无法用他所知道的任何理论来解释这种现象。
• The object of these experiments was to find the connection,if any,between the two phenomena.这些实验的目的就是探索这两种现象之间的联系，如果存在着任何联系的话。

39 equilibrium   

n.平衡，均衡，相称，均势，平静

参考例句：

• Change in the world around us disturbs our inner equilibrium.我们周围世界的变化扰乱了我们内心的平静。
• This is best expressed in the form of an equilibrium constant.这最好用平衡常数的形式来表示。

40 peculiar   

adj.古怪的，异常的；特殊的，特有的

参考例句：

• He walks in a peculiar fashion.他走路的样子很奇特。
• He looked at me with a very peculiar expression.他用一种很奇怪的表情看着我。

41 susceptible   

adj.过敏的，敏感的；易动感情的，易受感动的

参考例句：

• Children are more susceptible than adults.孩子比成人易受感动。
• We are all susceptible to advertising.我们都易受广告的影响。

42 distinguished   

adj.卓越的，杰出的，著名的

参考例句：

• Elephants are distinguished from other animals by their long noses.大象以其长长的鼻子显示出与其他动物的不同。
• A banquet was given in honor of the distinguished guests.宴会是为了向贵宾们致敬而举行的。

43 fleeting   

adj.短暂的，飞逝的

参考例句：

• The girls caught only a fleeting glimpse of the driver.女孩们只匆匆瞥了一眼司机。
• Knowing the life fleeting,she set herself to enjoy if as best as she could.她知道这种日子转瞬即逝，于是让自已尽情地享受。

44 stimulation   

n.刺激，激励，鼓舞

参考例句：

• The playgroup provides plenty of stimulation for the children.幼儿游戏组给孩子很多启发。
• You don't get any intellectual stimulation in this job.你不能从这份工作中获得任何智力启发。

45 inertia   

adj.惰性，惯性，懒惰，迟钝

参考例句：

• We had a feeling of inertia in the afternoon.下午我们感觉很懒。
• Inertia carried the plane onto the ground.飞机靠惯性着陆。

46 modification   

n.修改，改进，缓和，减轻

参考例句：

• The law,in its present form,is unjust;it needs modification.现行的法律是不公正的，它需要修改。
• The design requires considerable modification.这个设计需要作大的修改。

47 gutter   

n.沟，街沟，水槽，檐槽，贫民窟

参考例句：

• There's a cigarette packet thrown into the gutter.阴沟里有个香烟盒。
• He picked her out of the gutter and made her a great lady.他使她脱离贫苦生活，并成为贵妇。

48 gutters   

（路边）排水沟( gutter的名词复数 )； 阴沟； （屋顶的）天沟； 贫贱的境地

参考例句：

• Gutters lead the water into the ditch. 排水沟把水排到这条水沟里。
• They were born, they grew up in the gutters. 他们生了下来，以后就在街头长大。

49 psychical   

adj.有关特异功能现象的；有关特异功能官能的；灵魂的；心灵的

参考例句：

• Conclusion: The Liuhe-lottery does harm to people, s psychical health and should be for bidden. 结论：“六合彩”赌博有害人们心理卫生，应予以严禁。 来自互联网

50 recurring   

adj.往复的，再次发生的

参考例句：

• This kind of problem is recurring often. 这类问题经常发生。
• For our own country, it has been a time for recurring trial. 就我们国家而言，它经过了一个反复考验的时期。

51 mere   

adj.纯粹的；仅仅，只不过

参考例句：

• That is a mere repetition of what you said before.那不过是重复了你以前讲的话。
• It's a mere waste of time waiting any longer.再等下去纯粹是浪费时间。

52 recurrence   

n.复发，反复，重现

参考例句：

• More care in the future will prevent recurrence of the mistake.将来的小心可防止错误的重现。
• He was aware of the possibility of a recurrence of his illness.他知道他的病有可能复发。

53 snug   

adj.温暖舒适的，合身的，安全的；v.使整洁干净，舒适地依靠，紧贴；n.（英）酒吧里的私房

参考例句：

• He showed us into a snug little sitting room.他领我们走进了一间温暖而舒适的小客厅。
• She had a small but snug home.她有个小小的但很舒适的家。

54 resuscitate   

v.使复活，使苏醒

参考例句：

• A policeman and then a paramedic tried to resuscitate her.一名警察和一位护理人员先后试图救活她。
• As instructed by Rinpoche,we got the doctors to resuscitate him.遵照仁波切的指示，我们找来医生帮他进行急救。

55 symbolically   

ad.象征地，象征性地

参考例句：

• By wearing the ring on the third finger of the left hand, a married couple symbolically declares their eternal love for each other. 将婚戒戴在左手的第三只手指上，意味着夫妻双方象征性地宣告他们的爱情天长地久，他们定能白头偕老。
• Symbolically, he coughed to clear his throat. 周经理象征地咳一声无谓的嗽，清清嗓子。

56 symbolic   

adj.象征性的，符号的，象征主义的

参考例句：

• It is symbolic of the fighting spirit of modern womanhood.它象征着现代妇女的战斗精神。
• The Christian ceremony of baptism is a symbolic act.基督教的洗礼仪式是一种象征性的做法。

57 epoch   

n.(新)时代；历元

参考例句：

• The epoch of revolution creates great figures.革命时代造就伟大的人物。
• We're at the end of the historical epoch,and at the dawn of another.我们正处在一个历史时代的末期，另一个历史时代的开端。

58 intimacy   

n.熟悉，亲密，密切关系，亲昵的言行

参考例句：

• His claims to an intimacy with the President are somewhat exaggerated.他声称自己与总统关系密切，这有点言过其实。
• I wish there were a rule book for intimacy.我希望能有个关于亲密的规则。

59 forth   

adv.向前；向外，往外

参考例句：

• The wind moved the trees gently back and forth.风吹得树轻轻地来回摇晃。
• He gave forth a series of works in rapid succession.他很快连续发表了一系列的作品。

60 perfectly   

adv.完美地，无可非议地，彻底地

参考例句：

• The witnesses were each perfectly certain of what they said.证人们个个对自己所说的话十分肯定。
• Everything that we're doing is all perfectly above board.我们做的每件事情都是光明正大的。

61 Christian   

adj.基督教徒的；n.基督教徒

参考例句：

• They always addressed each other by their Christian name.他们总是以教名互相称呼。
• His mother is a sincere Christian.他母亲是个虔诚的基督教徒。

62 formerly   

adv.从前，以前

参考例句：

• We now enjoy these comforts of which formerly we had only heard.我们现在享受到了过去只是听说过的那些舒适条件。
• This boat was formerly used on the rivers of China.这船从前航行在中国内河里。

63 beheld   

v.看，注视( behold的过去式和过去分词 )；瞧；看呀；（叙述中用于引出某人意外的出现）哎哟

参考例句：

• His eyes had never beheld such opulence. 他从未见过这样的财富。 来自《简明英汉词典》
• The soul beheld its features in the mirror of the passing moment. 灵魂在逝去的瞬间的镜子中看到了自己的模样。 来自英汉文学 - 红字

64 apprehension   

n.理解，领悟；逮捕，拘捕；忧虑

参考例句：

• There were still areas of doubt and her apprehension grew.有些地方仍然存疑，于是她越来越担心。
• She is a girl of weak apprehension.她是一个理解力很差的女孩。

65 faculty   

n.才能；学院，系；(学院或系的)全体教学人员

参考例句：

• He has a great faculty for learning foreign languages.他有学习外语的天赋。
• He has the faculty of saying the right thing at the right time.他有在恰当的时候说恰当的话的才智。

66 faculties   

n.能力( faculty的名词复数 )；全体教职员；技巧；院

参考例句：

• Although he's ninety, his mental faculties remain unimpaired. 他虽年届九旬，但头脑仍然清晰。
• All your faculties have come into play in your work. 在你的工作中，你的全部才能已起到了作用。 来自《简明英汉词典》

67 awaken   

vi.醒，觉醒；vt.唤醒，使觉醒，唤起，激起

参考例句：

• Old people awaken early in the morning.老年人早晨醒得早。
• Please awaken me at six.请于六点叫醒我。

68 retention   

n.保留，保持，保持力，记忆力

参考例句：

• They advocate the retention of our nuclear power plants.他们主张保留我们的核电厂。
• His retention of energy at this hour is really surprising.人们惊叹他在这个时候还能保持如此旺盛的精力。

69 procure   

vt.获得，取得，促成；vi.拉皮条

参考例句：

• Can you procure some specimens for me?你能替我弄到一些标本吗？
• I'll try my best to procure you that original French novel.我将尽全力给你搞到那本原版法国小说。

70 expedient   

adj.有用的，有利的；n.紧急的办法，权宜之计

参考例句：

• The government found it expedient to relax censorship a little.政府发现略微放宽审查是可取的。
• Every kind of expedient was devised by our friends.我们的朋友想出了各种各样的应急办法。

71 attained   

（通常经过努力）实现( attain的过去式和过去分词 )； 达到； 获得； 达到（某年龄、水平、状况）

参考例句：

• She has attained the degree of Master of Arts. 她已获得文学硕士学位。
• Lu Hsun attained a high position in the republic of letters. 鲁迅在文坛上获得崇高的地位。

72 rummage   

v./n.翻寻，仔细检查

参考例句：

• He had a good rummage inside the sofa.他把沙发内部彻底搜寻了一翻。
• The old lady began to rummage in her pocket for her spectacles.老太太开始在口袋里摸索，找她的眼镜。

73 machinery   

n.(总称)机械，机器；机构

参考例句：

• Has the machinery been put up ready for the broadcast?广播器材安装完毕了吗？
• Machinery ought to be well maintained all the time.机器应该随时注意维护。

74 previously   

adv.以前，先前（地）

参考例句：

• The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
• Let me digress for a moment and explain what had happened previously.让我岔开一会儿，解释原先发生了什么。

75 resuscitation   

n.复活

参考例句：

• Despite attempts at resuscitation,Mr Lynch died a week later in hospital.虽经全力抢救，但林奇先生一周以后还是在医院去世了。
• We gave him mouth-to-mouth resuscitation and heart massage.我们对他进行了口对口复苏救治和心脏按摩。

76 slumbering   

微睡，睡眠（slumber的现在分词形式）

参考例句：

• It was quiet. All the other inhabitants of the slums were slumbering. 贫民窟里的人已经睡眠静了。
• Then soft music filled the air and soothed the slumbering heroes. 接着，空中响起了柔和的乐声，抚慰着安睡的英雄。

77 purely   

adv.纯粹地，完全地

参考例句：

• I helped him purely and simply out of friendship.我帮他纯粹是出于友情。
• This disproves the theory that children are purely imitative.这证明认为儿童只会单纯地模仿的理论是站不住脚的。

78 recesses   

n.壁凹( recess的名词复数 )；（工作或业务活动的）中止或暂停期间；学校的课间休息；某物内部的凹形空间v.把某物放在墙壁的凹处( recess的第三人称单数 )；将（墙）做成凹形，在（墙）上做壁龛；休息，休会，休庭

参考例句：

• I could see the inmost recesses. 我能看见最深处。 来自《简明英汉词典》
• I had continually pushed my doubts to the darker recesses of my mind. 我一直把怀疑深深地隐藏在心中。 来自《简明英汉词典》

79 functional   

adj.为实用而设计的，具备功能的，起作用的

参考例句：

• The telephone was out of order,but is functional now.电话刚才坏了，但现在可以用了。
• The furniture is not fancy,just functional.这些家具不是摆着好看的，只是为了实用。

80 tracts   

大片土地( tract的名词复数 )； 地带； （体内的）道； （尤指宣扬宗教、伦理或政治的）短文

参考例句：

• vast tracts of forest 大片大片的森林
• There are tracts of desert in Australia. 澳大利亚有大片沙漠。

81 rendering   

n.表现，描写

参考例句：

• She gave a splendid rendering of Beethoven's piano sonata.她精彩地演奏了贝多芬的钢琴奏鸣曲。
• His narrative is a super rendering of dialect speech and idiom.他的叙述是方言和土语最成功的运用。

82 disposition   

n.性情，性格；意向，倾向；排列，部署

参考例句：

• He has made a good disposition of his property.他已对财产作了妥善处理。
• He has a cheerful disposition.他性情开朗。

83 explicitly   

ad.明确地，显然地

参考例句：

• The plan does not explicitly endorse the private ownership of land. 该计划没有明确地支持土地私有制。
• SARA amended section 113 to provide explicitly for a right to contribution. 《最高基金修正与再授权法案》修正了第123条，清楚地规定了分配权。 来自英汉非文学 - 环境法 - 环境法

84 physiological   

adj.生理学的，生理学上的

参考例句：

• He bought a physiological book.他买了一本生理学方面的书。
• Every individual has a physiological requirement for each nutrient.每个人对每种营养成分都有一种生理上的需要。

85 subsided   

v.（土地）下陷（因在地下采矿）( subside的过去式和过去分词 )；减弱；下降至较低或正常水平；一下子坐在椅子等上

参考例句：

• After the heavy rains part of the road subsided. 大雨过后，部分公路塌陷了。 来自《简明英汉词典》
• By evening the storm had subsided and all was quiet again. 傍晚， 暴风雨已经过去，四周开始沉寂下来。 来自《现代汉英综合大词典》

86 whit   

n.一点，丝毫

参考例句：

• There's not a whit of truth in the statement.这声明里没有丝毫的真实性。
• He did not seem a whit concerned.他看来毫不在乎。

87 psychology   

n.心理，心理学，心理状态

参考例句：

• She has a background in child psychology.她受过儿童心理学的教育。
• He studied philosophy and psychology at Cambridge.他在剑桥大学学习哲学和心理学。

88 recurs   

再发生，复发( recur的第三人称单数 )

参考例句：

• This theme recurs several times throughout the book. 这一主题在整部书里出现了好几次。
• Leap year recurs every four years. 每四年闰年一次。

89 extrinsic   

adj.外部的；不紧要的

参考例句：

• Nowadays there are more extrinsic pressures to get married.现在来自外部的结婚压力多了。
• The question is extrinsic to our discussion.这个问题和我们的讨论无关。

90 cerebral   

adj.脑的，大脑的；有智力的，理智型的

参考例句：

• Your left cerebral hemisphere controls the right-hand side of your body.你的左半脑控制身体的右半身。
• He is a precise,methodical,cerebral man who carefully chooses his words.他是一个一丝不苟、有条理和理智的人，措辞谨慎。

91 countenance   

n.脸色，面容；面部表情；vt.支持，赞同

参考例句：

• At the sight of this photograph he changed his countenance.他一看见这张照片脸色就变了。
• I made a fierce countenance as if I would eat him alive.我脸色恶狠狠地，仿佛要把他活生生地吞下去。

92 penumbra   

n.（日蚀）半影部

参考例句：

• This includes the continuous survey of umbra and penumbra of the sunspot.这包括对太阳黑子本影和半影持续的观测。
• A penumbra of doubt surrounds the incident.疑惑的阴影笼罩着该事件。

93 motive   

n.动机，目的；adv.发动的，运动的

参考例句：

• The police could not find a motive for the murder.警察不能找到谋杀的动机。
• He had some motive in telling this fable.他讲这寓言故事是有用意的。

94 solely   

adv.仅仅，唯一地

参考例句：

• Success should not be measured solely by educational achievement.成功与否不应只用学业成绩来衡量。
• The town depends almost solely on the tourist trade.这座城市几乎完全靠旅游业维持。

95 peculiarities   

n. 特质, 特性, 怪癖, 古怪

参考例句：

• the cultural peculiarities of the English 英国人的文化特点
• He used to mimic speech peculiarities of another. 他过去总是模仿别人讲话的特点。

96 casually   

adv.漠不关心地，无动于衷地，不负责任地

参考例句：

• She remarked casually that she was changing her job.她当时漫不经心地说要换工作。
• I casually mentioned that I might be interested in working abroad.我不经意地提到我可能会对出国工作感兴趣。

97 recedes   

v.逐渐远离( recede的第三人称单数 )；向后倾斜；自原处后退或避开别人的注视；尤指问题

参考例句：

• For this reason the near point gradually recedes as one grows older. 由于这个原因，随着人渐渐变老，近点便逐渐后退。 来自辞典例句
• Silent, mournful, abandoned, broken, Czechoslovakia recedes into the darkness. 缄默的、悲哀的、被抛弃的、支离破碎的捷克斯洛伐克，已在黑暗之中。 来自辞典例句

98 vaguely   

adv.含糊地，暖昧地

参考例句：

• He had talked vaguely of going to work abroad.他含糊其词地说了到国外工作的事。
• He looked vaguely before him with unseeing eyes.他迷迷糊糊的望着前面，对一切都视而不见。

99 swarm   

n.(昆虫)等一大群；vi.成群飞舞；蜂拥而入

参考例句：

• There is a swarm of bees in the tree.这树上有一窝蜜蜂。
• A swarm of ants are moving busily.一群蚂蚁正在忙碌地搬家。

100 recoiled   

v.畏缩( recoil的过去式和过去分词 )；退缩；报应；返回

参考例句：

• She recoiled from his touch. 她躲开他的触摸。
• Howard recoiled a little at the sharpness in my voice. 听到我的尖声，霍华德往后缩了一下。 来自《简明英汉词典》

101 proceedings   

n.进程，过程，议程；诉讼(程序)；公报

参考例句：

• He was released on bail pending committal proceedings. 他交保获释正在候审。
• to initiate legal proceedings against sb 对某人提起诉讼

102 receded   

v.逐渐远离( recede的过去式和过去分词 )；向后倾斜；自原处后退或避开别人的注视；尤指问题

参考例句：

• The floodwaters have now receded. 洪水现已消退。
• The sound of the truck receded into the distance. 卡车的声音渐渐在远处消失了。

103 situated   

adj.坐落在...的，处于某种境地的

参考例句：

• The village is situated at the margin of a forest.村子位于森林的边缘。
• She is awkwardly situated.她的处境困难。

104 carnival   

n.嘉年华会，狂欢，狂欢节，巡回表演

参考例句：

• I got some good shots of the carnival.我有几个狂欢节的精彩镜头。
• Our street puts on a carnival every year.我们街的居民每年举行一次嘉年华会。

105 annulled   

v.宣告无效( annul的过去式和过去分词 )；取消；使消失；抹去

参考例句：

• Their marriage was annulled after just six months. 他们的婚姻仅过半年就宣告取消。
• Many laws made by the former regime have been annulled. 前政权制定的许多法律被宣布无效。 来自《简明英汉词典》

106 excellence   

n.优秀，杰出，(pl.)优点，美德

参考例句：

• His art has reached a high degree of excellence.他的艺术已达到炉火纯青的地步。
• My performance is far below excellence.我的表演离优秀还差得远呢。

107 persistence   

n.坚持，持续，存留

参考例句：

• The persistence of a cough in his daughter puzzled him.他女儿持续的咳嗽把他难住了。
• He achieved success through dogged persistence.他靠着坚持不懈取得了成功。

108 tenacity   

n.坚韧

参考例句：

• Tenacity is the bridge to success.坚韧是通向成功的桥。
• The athletes displayed great tenacity throughout the contest.运动员在比赛中表现出坚韧的斗志。

109 retentive   

v.保留的，有记忆的；adv.有记性地，记性强地；n.保持力

参考例句：

• Luke had an amazingly retentive memory.卢克记忆力惊人。
• He is a scholar who has wide learning and a retentive memory.他是一位博闻强记的学者。

110 retentiveness   

n.有记性；记性强；保持力；好记性

参考例句：

111 infancy   

n.婴儿期；幼年期；初期

参考例句：

• He came to England in his infancy.他幼年时期来到英国。
• Their research is only in its infancy.他们的研究处于初级阶段。

112 desultory   

adj.散漫的，无方法的

参考例句：

• Do not let the discussion fragment into a desultory conversation with no clear direction.不要让讨论变得支离破碎，成为没有明确方向的漫谈。
• The constables made a desultory attempt to keep them away from the barn.警察漫不经心地拦着不让他们靠近谷仓。

113 anecdotes   

n.掌故，趣闻，轶事( anecdote的名词复数 )

参考例句：

• amusing anecdotes about his brief career as an actor 关于他短暂演员生涯的趣闻逸事
• He related several anecdotes about his first years as a congressman. 他讲述自己初任议员那几年的几则轶事。 来自《简明英汉词典》

114 quotations   

n.引用( quotation的名词复数 )；[商业]行情（报告）；（货物或股票的）市价；时价

参考例句：

• The insurance company requires three quotations for repairs to the car. 保险公司要修理这辆汽车的三家修理厂的报价单。 来自《简明英汉词典》
• These quotations cannot readily be traced to their sources. 这些引语很难查出出自何处。 来自《现代汉英综合大词典》

115 mighty   

adj.强有力的；巨大的

参考例句：

• A mighty force was about to break loose.一股巨大的力量即将迸发而出。
• The mighty iceberg came into view.巨大的冰山出现在眼前。

116 influential   

adj.有影响的，有权势的

参考例句：

• He always tries to get in with the most influential people.他总是试图巴结最有影响的人物。
• He is a very influential man in the government.他在政府中是个很有影响的人物。

117 retrace   

v.折回；追溯，探源

参考例句：

• He retraced his steps to the spot where he'd left the case.他折回到他丢下箱子的地方。
• You must retrace your steps.你必须折回原来走过的路。

118 attachments   

n.（用电子邮件发送的）附件( attachment的名词复数 )；附着；连接；附属物

参考例句：

• The vacuum cleaner has four different attachments. 吸尘器有四个不同的附件。
• It's an electric drill with a range of different attachments. 这是一个带有各种配件的电钻。

119 briefly   

adv.简单地，简短地

参考例句：

• I want to touch briefly on another aspect of the problem.我想简单地谈一下这个问题的另一方面。
• He was kidnapped and briefly detained by a terrorist group.他被一个恐怖组织绑架并短暂拘禁。

120 remains   

n.剩余物，残留物；遗体，遗迹

参考例句：

• He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
• The remains of the meal were fed to the dog.残羹剩饭喂狗了。

121 feats   

功绩，伟业，技艺( feat的名词复数 )

参考例句：

• He used to astound his friends with feats of physical endurance. 过去，他表现出来的惊人耐力常让朋友们大吃一惊。
• His heroic feats made him a legend in his own time. 他的英雄业绩使他成了他那个时代的传奇人物。

122 copiousness   

n.丰裕，旺盛

参考例句：

123 bestow   

v.把…赠与，把…授予；花费

参考例句：

• He wished to bestow great honors upon the hero.他希望将那些伟大的荣誉授予这位英雄。
• What great inspiration wiII you bestow on me?你有什么伟大的灵感能馈赠给我？

124 incompatible   

adj.不相容的，不协调的，不相配的

参考例句：

• His plan is incompatible with my intent.他的计划与我的意图不相符。
• Speed and safety are not necessarily incompatible.速度和安全未必不相容。

125 cramming   

n.塞满，填鸭式的用功v.塞入( cram的现在分词 )；填塞；塞满；（为考试而）死记硬背功课

参考例句：

• Being hungry for the whole morning, I couldn't help cramming myself. 我饿了一上午，禁不住狼吞虎咽了起来。 来自《简明英汉词典》
• She's cramming for her history exam. 她考历史之前临时抱佛脚。 来自《简明英汉词典》

126 ordeal   

n.苦难经历，（尤指对品格、耐力的）严峻考验

参考例句：

• She managed to keep her sanity throughout the ordeal.在那场磨难中她始终保持神志正常。
• Being lost in the wilderness for a week was an ordeal for me.在荒野里迷路一星期对我来说真是一场磨难。

127 relatively   

adv.比较...地，相对地

参考例句：

• The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
• The operation was relatively painless.手术相对来说不痛。

128 awakened   

v.（使）醒( awaken的过去式和过去分词 )；（使）觉醒；弄醒；（使）意识到

参考例句：

• She awakened to the sound of birds singing. 她醒来听到鸟的叫声。
• The public has been awakened to the full horror of the situation. 公众完全意识到了这一状况的可怕程度。 来自《简明英汉词典》

129 inevitable   

adj.不可避免的，必然发生的

参考例句：

• Mary was wearing her inevitable large hat.玛丽戴着她总是戴的那顶大帽子。
• The defeat had inevitable consequences for British policy.战败对英国政策不可避免地产生了影响。

130 fabric   

n.织物，织品，布；构造，结构，组织

参考例句：

• The fabric will spot easily.这种织品很容易玷污。
• I don't like the pattern on the fabric.我不喜欢那块布料上的图案。

131 turpitude   

n.可耻；邪恶

参考例句：

• He was considered unfit to hold office because of moral turpitude.因为道德上的可耻行为，他被认为不适担任公务员。
• Let every declamation turn upon the beauty of liberty and virtue,and the deformity,turpitude,and malignity of slavery and vice.让每一篇演讲都来谈自由和道德之美，都来谈奴役和邪恶之丑陋、卑鄙和恶毒。

132 infinitely   

adv.无限地，无穷地

参考例句：

• There is an infinitely bright future ahead of us.我们有无限光明的前途。
• The universe is infinitely large.宇宙是无限大的。

133 labor   

n.劳动，努力，工作，劳工；分娩；vi.劳动，努力，苦干；vt.详细分析；麻烦

参考例句：

• We are never late in satisfying him for his labor.我们从不延误付给他劳动报酬。
• He was completely spent after two weeks of hard labor.艰苦劳动两周后，他已经疲惫不堪了。

134 hygiene   

n.健康法，卫生学 （a.hygienic）

参考例句：

• Their course of study includes elementary hygiene and medical theory.他们的课程包括基础卫生学和医疗知识。
• He's going to give us a lecture on public hygiene.他要给我们作关于公共卫生方面的报告。

135 bracing   

adj.令人振奋的

参考例句：

• The country is bracing itself for the threatened enemy invasion. 这个国家正准备奋起抵抗敌人的入侵威胁。
• The atmosphere in the new government was bracing. 新政府的气氛是令人振奋的。

136 systematically   

adv.有系统地

参考例句：

• This government has systematically run down public services since it took office.这一屆政府自上台以来系统地削减了公共服务。
• The rainforest is being systematically destroyed.雨林正被系统地毀灭。

137 plausible   

adj.似真实的，似乎有理的，似乎可信的

参考例句：

• His story sounded plausible.他说的那番话似乎是真实的。
• Her story sounded perfectly plausible.她的说辞听起来言之有理。

138 doctrine   

n.教义；主义；学说

参考例句：

• He was impelled to proclaim his doctrine.他不得不宣扬他的教义。
• The council met to consider changes to doctrine.宗教议会开会考虑更改教义。

139 alleged   

a.被指控的，嫌疑的

参考例句：

• It was alleged that he had taken bribes while in office. 他被指称在任时收受贿赂。
• alleged irregularities in the election campaign 被指称竞选运动中的不正当行为

140 precedents   

引用单元； 范例( precedent的名词复数 )； 先前出现的事例； 前例； 先例

参考例句：

• There is no lack of precedents in this connection. 不乏先例。
• He copied after bad precedents. 他仿效恶例。

141 intonation   

n.语调，声调；发声

参考例句：

• The teacher checks for pronunciation and intonation.老师在检查发音和语调。
• Questions are spoken with a rising intonation.疑问句是以升调说出来的。

142 impaired   

adj.受损的；出毛病的；有（身体或智力）缺陷的v.损害，削弱( impair的过去式和过去分词 )

参考例句：

• Much reading has impaired his vision. 大量读书损害了他的视力。 来自《现代汉英综合大词典》
• His hearing is somewhat impaired. 他的听觉已受到一定程度的损害。 来自《现代汉英综合大词典》

143 generic   

adj.一般的，普通的，共有的

参考例句：

• I usually buy generic clothes instead of name brands.我通常买普通的衣服，不买名牌。
• The generic woman appears to have an extraordinary faculty for swallowing the individual.一般妇女在婚后似乎有特别突出的抑制个性的能力。

144 brute   

n.野兽，兽性

参考例句：

• The aggressor troops are not many degrees removed from the brute.侵略军简直象一群野兽。
• That dog is a dangerous brute.It bites people.那条狗是危险的畜牲，它咬人。

145 pervades   

v.遍及，弥漫( pervade的第三人称单数 )

参考例句：

• An unpleasant smell pervades the house. 一种难闻的气味弥漫了全屋。 来自《简明英汉词典》
• An atmosphere of pessimism pervades the economy. 悲观的气氛笼罩着整个经济。 来自辞典例句

146 judicious   

adj.明智的，明断的，能作出明智决定的

参考例句：

• We should listen to the judicious opinion of that old man.我们应该听取那位老人明智的意见。
• A judicious parent encourages his children to make their own decisions.贤明的父亲鼓励儿女自作抉择。

147 remarkably   

ad.不同寻常地，相当地

参考例句：

• I thought she was remarkably restrained in the circumstances. 我认为她在那种情况下非常克制。
• He made a remarkably swift recovery. 他康复得相当快。

148 resuscitating   

v.使（某人或某物）恢复知觉，苏醒( resuscitate的现在分词 )

参考例句：

• Purpose To observe the curative effect of resuscitating and scalp acupunctures on apoplectic hemiplegia. 目的观察醒脑开窍法与头针治疗中风偏瘫的疗效。 来自互联网

149 wrought   

v.引起；以…原料制作；运转；adj.制造的

参考例句：

• Events in Paris wrought a change in British opinion towards France and Germany.巴黎发生的事件改变了英国对法国和德国的看法。
• It's a walking stick with a gold head wrought in the form of a flower.那是一个金质花形包头的拐杖。

150 sieve   

n.筛，滤器，漏勺

参考例句：

• We often shake flour through a sieve.我们经常用筛子筛面粉。
• Finally,it is like drawing water with a sieve.到头来，竹篮打水一场空。

151 accurately   

adv.准确地，精确地

参考例句：

• It is hard to hit the ball accurately.准确地击中球很难。
• Now scientists can forecast the weather accurately.现在科学家们能准确地预报天气。

152 vividly   

adv.清楚地，鲜明地，生动地

参考例句：

• The speaker pictured the suffering of the poor vividly.演讲者很生动地描述了穷人的生活。
• The characters in the book are vividly presented.这本书里的人物写得栩栩如生。

153 confession   

n.自白，供认，承认

参考例句：

• Her confession was simply tantamount to a casual explanation.她的自白简直等于一篇即席说明。
• The police used torture to extort a confession from him.警察对他用刑逼供。

154 recording   

n.录音，记录

参考例句：

• How long will the recording of the song take?录下这首歌得花多少时间？
• I want to play you a recording of the rehearsal.我想给你放一下彩排的录像。

155 habitual   

adj.习惯性的；通常的，惯常的

参考例句：

• He is a habitual criminal.他是一个惯犯。
• They are habitual visitors to our house.他们是我家的常客。

156 terminology   

n.术语；专有名词

参考例句：

• He particularly criticized the terminology in the document.他特别批评了文件中使用的术语。
• The article uses rather specialized musical terminology.这篇文章用了相当专业的音乐术语。

157 intensification   

n.激烈化，增强明暗度；加厚

参考例句：

• The intensification of the immunological response represents the body's natural defense. 增强免疫反应代表身体的自然保卫。 来自辞典例句
• Agriculture in the developing nations is not irreversibly committed, to a particular pattern of intensification. 发展中国家的农业并没有完全为某种集约化形式所束缚。 来自辞典例句

158 analyzing   

v.分析；分析( analyze的现在分词 )；分解；解释；对…进行心理分析n.分析

参考例句：

• Analyzing the date of some socialist countries presents even greater problem s. 分析某些社会主义国家的统计数据，暴露出的问题甚至更大。 来自辞典例句
• He undoubtedly was not far off the mark in analyzing its predictions. 当然，他对其预测所作的分析倒也八九不离十。 来自辞典例句

159 entirely   

ad.全部地，完整地；完全地，彻底地

参考例句：

• The fire was entirely caused by their neglect of duty. 那场火灾完全是由于他们失职而引起的。
• His life was entirely given up to the educational work. 他的一生统统献给了教育工作。

160 deliberately   

adv.审慎地；蓄意地；故意地

参考例句：

• The girl gave the show away deliberately.女孩故意泄露秘密。
• They deliberately shifted off the argument.他们故意回避这个论点。

161 digit   

n.零到九的阿拉伯数字，手指，脚趾

参考例句：

• Her telephone number differs from mine by one digit.她的电话号码和我的只差一个数字。
• Many animals have five digits.许多动物有5趾。

162 velocity   

n.速度，速率

参考例句：

• Einstein's theory links energy with mass and velocity of light.爱因斯坦的理论把能量同质量和光速联系起来。
• The velocity of light is about 300000 kilometres per second.光速约为每秒300000公里。

163 vowels   

n.元音，元音字母( vowel的名词复数 )

参考例句：

• Vowels possess greater sonority than consonants. 元音比辅音响亮。 来自《现代英汉综合大词典》
• Note the various sounds of vowels followed by r. 注意r跟随的各种元音的发音。 来自超越目标英语 第3册

164 copper   

n.铜；铜币；铜器；adj.铜(制)的；(紫)铜色的

参考例句：

• The students are asked to prove the purity of copper.要求学生们检验铜的纯度。
• Copper is a good medium for the conduction of heat and electricity.铜是热和电的良导体。

165 bonnet   

n.无边女帽；童帽

参考例句：

• The baby's bonnet keeps the sun out of her eyes.婴孩的帽子遮住阳光，使之不刺眼。
• She wore a faded black bonnet garnished with faded artificial flowers.她戴着一顶褪了色的黑色无边帽，帽上缀着褪了色的假花。

166 apparently   

adv.显然地；表面上，似乎

参考例句：

• An apparently blind alley leads suddenly into an open space.山穷水尽，豁然开朗。
• He was apparently much surprised at the news.他对那个消息显然感到十分惊异。

167 isolated   

adj.与世隔绝的

参考例句：

• His bad behaviour was just an isolated incident. 他的不良行为只是个别事件。
• Patients with the disease should be isolated. 这种病的患者应予以隔离。

168 immunity   

n.优惠；免除；豁免，豁免权

参考例句：

• The law gives public schools immunity from taxation.法律免除公立学校的纳税义务。
• He claims diplomatic immunity to avoid being arrested.他要求外交豁免以便避免被捕。

169 delusion   

n.谬见，欺骗，幻觉，迷惑

参考例句：

• He is under the delusion that he is Napoleon.他患了妄想症，认为自己是拿破仑。
• I was under the delusion that he intended to marry me.我误认为他要娶我。

170 brigands   

n.土匪，强盗( brigand的名词复数 )

参考例句：

• They say there are brigands hiding along the way. 他们说沿路隐藏着土匪。 来自《简明英汉词典》
• The brigands demanded tribute from passing vehicles. 土匪向过往车辆勒索钱财。 来自辞典例句

171 bent   

n.爱好，癖好；adj.弯的；决心的，一心的

参考例句：

• He was fully bent upon the project.他一心扑在这项计划上。
• We bent over backward to help them.我们尽了最大努力帮助他们。

172 killing   

n.巨额利润；突然赚大钱，发大财

参考例句：

• Investors are set to make a killing from the sell-off.投资者准备清仓以便大赚一笔。
• Last week my brother made a killing on Wall Street.上个周我兄弟在华尔街赚了一大笔。

173 mania   

n.疯狂；躁狂症，狂热，癖好

参考例句：

• Football mania is sweeping the country.足球热正风靡全国。
• Collecting small items can easily become a mania.收藏零星物品往往容易变成一种癖好。

174 delirium   

n. 神智昏迷,说胡话;极度兴奋

参考例句：

• In her delirium, she had fallen to the floor several times. 她在神志不清的状态下几次摔倒在地上。
• For the next nine months, Job was in constant delirium.接下来的九个月，约伯处于持续精神错乱的状态。

175 aptitude   

n.(学习方面的)才能，资质，天资

参考例句：

• That student has an aptitude for mathematics.那个学生有数学方面的天赋。
• As a child,he showed an aptitude for the piano.在孩提时代，他显露出对于钢琴的天赋。

176 aptitudes   

（学习方面的）才能，资质，天资( aptitude的名词复数 )

参考例句：

• They all require special aptitudes combined with special training. 他们都应具有专门技能，并受过专门训练。
• Do program development with passion. has aptitudes for learning. research. innovation. 热爱程序开发工作。具有学习。钻研。创新的精神。

177 obliterated   

v.除去( obliterate的过去式和过去分词 )；涂去；擦掉；彻底破坏或毁灭

参考例句：

• The building was completely obliterated by the bomb. 炸弹把那座建筑物彻底摧毁了。
• He began to drink, drank himself to intoxication, till he slept obliterated. 他一直喝，喝到他快要迷糊地睡着了。 来自《简明英汉词典》

178 impairs   

v.损害，削弱( impair的第三人称单数 )

参考例句：

• Smoking impairs our health. 吸烟会损害我们的健康。 来自《简明英汉词典》
• Almost anything that impairs liver function can cause hepatitis. 任何有损于肝功能的因素，几乎都会引起肝炎。 来自辞典例句

179 swarming   

密集( swarm的现在分词 )； 云集； 成群地移动； 蜜蜂或其他飞行昆虫成群地飞来飞去

参考例句：

• The sacks of rice were swarming with bugs. 一袋袋的米里长满了虫子。
• The beach is swarming with bathers. 海滩满是海水浴的人。

180 dwarfs   

n.侏儒，矮子（dwarf的复数形式）vt.（使）显得矮小（dwarf的第三人称单数形式）

参考例句：

• Shakespeare dwarfs other dramatists. 莎士比亚使其他剧作家相形见绌。 来自《简明英汉词典》
• The new building dwarfs all the other buildings in the town. 新大楼使城里所有其他建筑物都显得矮小了。 来自辞典例句

181 crimson   

n./adj.深(绯)红色(的)；vi.脸变绯红色

参考例句：

• She went crimson with embarrassment.她羞得满脸通红。
• Maple leaves have turned crimson.枫叶已经红了。

182 velvet   

n.丝绒，天鹅绒；adj.丝绒制的，柔软的

参考例句：

• This material feels like velvet.这料子摸起来像丝绒。
• The new settlers wore the finest silk and velvet clothing.新来的移民穿着最华丽的丝绸和天鹅绒衣服。

183 gilded   

a.镀金的，富有的

参考例句：

• The golden light gilded the sea. 金色的阳光使大海如金子般闪闪发光。
• "Friends, they are only gilded disks of lead!" "朋友们，这只不过是些镀金的铅饼！ 来自英汉文学 - 败坏赫德莱堡

184 intoxicated   

喝醉的，极其兴奋的

参考例句：

• She was intoxicated with success. 她为成功所陶醉。
• They became deeply intoxicated and totally disoriented. 他们酩酊大醉，东南西北全然不辨。

185 primitive   

adj.原始的；简单的；n.原(始)人，原始事物

参考例句：

• It is a primitive instinct to flee a place of danger.逃离危险的地方是一种原始本能。
• His book describes the march of the civilization of a primitive society.他的著作描述了一个原始社会的开化过程。

186 delightful   

adj.令人高兴的，使人快乐的

参考例句：

• We had a delightful time by the seashore last Sunday.上星期天我们在海滨玩得真痛快。
• Peter played a delightful melody on his flute.彼得用笛子吹奏了一支欢快的曲子。

187 effaced   

v.擦掉( efface的过去式和过去分词 )；抹去；超越；使黯然失色

参考例句：

• Someone has effaced part of the address on his letter. 有人把他信上的一部分地址擦掉了。 来自《现代英汉综合大词典》
• The name of the ship had been effaced from the menus. 那艘船的名字已经从菜单中删除了。 来自辞典例句

188 beset   

v.镶嵌；困扰，包围

参考例句：

• She wanted to enjoy her retirement without being beset by financial worries.她想享受退休生活而不必为金钱担忧。
• The plan was beset with difficulties from the beginning.这项计划自开始就困难重重。

189 distractions   

n.使人分心的事[人]( distraction的名词复数 )；娱乐，消遣；心烦意乱；精神错乱

参考例句：

• I find it hard to work at home because there are too many distractions. 我发觉在家里工作很难，因为使人分心的事太多。
• There are too many distractions here to work properly. 这里叫人分心的事太多，使人无法好好工作。 来自《简明英汉词典》

190 persistent   

adj.坚持不懈的，执意的；持续的

参考例句：

• Albert had a persistent headache that lasted for three days.艾伯特连续头痛了三天。
• She felt embarrassed by his persistent attentions.他不时地向她大献殷勤，使她很难为情。

191 engulfed   

v.吞没，包住( engulf的过去式和过去分词 )

参考例句：

• He was engulfed by a crowd of reporters. 他被一群记者团团围住。
• The little boat was engulfed by the waves. 小船被波浪吞没了。 来自《简明英汉词典》

192 surgical   

adj.外科的，外科医生的，手术上的

参考例句：

• He performs the surgical operations at the Red Cross Hospital.他在红十字会医院做外科手术。
• All surgical instruments must be sterilised before use.所有的外科手术器械在使用之前，必须消毒。

193 applied   

adj.应用的；v.应用，适用

参考例句：

• She plans to take a course in applied linguistics.她打算学习应用语言学课程。
• This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。

194 durability   

n.经久性，耐用性

参考例句：

• Nylons have the virtue of durability.尼龙丝袜有耐穿的优点。

195 adversaries   

n.对手，敌手( adversary的名词复数 )

参考例句：

• That would cause potential adversaries to recoil from a challenge. 这会迫使潜在的敌人在挑战面前退缩。 来自辞典例句
• Every adversaries are more comfortable with a predictable, coherent America. 就连敌人也会因有可以预料的，始终一致的美国而感到舒服得多。 来自辞典例句

196 incessantly   

ad.不停地

参考例句：

• The machines roar incessantly during the hours of daylight. 机器在白天隆隆地响个不停。
• It rained incessantly for the whole two weeks. 雨不间断地下了整整两个星期。

197 attentively   

adv.聚精会神地；周到地；谛；凝神

参考例句：

• She listened attentively while I poured out my problems. 我倾吐心中的烦恼时，她一直在注意听。 来自《简明英汉词典》
• She listened attentively and set down every word he said. 她专心听着，把他说的话一字不漏地记下来。 来自《简明英汉词典》

198 contrive   

vt.谋划，策划；设法做到；设计，想出

参考例句：

• Can you contrive to be here a little earlier?你能不能早一点来？
• How could you contrive to make such a mess of things?你怎么把事情弄得一团糟呢？

199 tint   

n.淡色，浅色；染发剂；vt.着以淡淡的颜色

参考例句：

• You can't get up that naturalness and artless rosy tint in after days.你今后不再会有这种自然和朴实无华的红润脸色。
• She gave me instructions on how to apply the tint.她告诉我如何使用染发剂。

200 confluence   

n.汇合，聚集

参考例句：

• They built the city at the confluence of two rivers.他们建造了城市的汇合两条河流。
• The whole DV movements actually was a confluence of several trends.整个当时的DV运动，实际上是几股潮流的同谋。

201 derived   

vi.起源；由来；衍生；导出v.得到( derive的过去式和过去分词 )；（从…中）得到获得；源于；（从…中）提取

参考例句：

• Many English words are derived from Latin and Greek. 英语很多词源出于拉丁文和希腊文。 来自《简明英汉词典》
• He derived his enthusiasm for literature from his father. 他对文学的爱好是受他父亲的影响。 来自《简明英汉词典》

202 renovates   

翻新，修复，整修( renovate的第三人称单数 )

参考例句：

203 projection   

n.发射，计划，突出部分

参考例句：

• Projection takes place with a minimum of awareness or conscious control.投射在最少的知觉或意识控制下发生。
• The projection of increases in number of house-holds is correct.对户数增加的推算是正确的。

204 backwards   

adv.往回地，向原处，倒，相反，前后倒置地

参考例句：

• He turned on the light and began to pace backwards and forwards.他打开电灯并开始走来走去。
• All the girls fell over backwards to get the party ready.姑娘们迫不及待地为聚会做准备。

205 misuse   

n.误用，滥用；vt.误用，滥用

参考例句：

• It disturbs me profoundly that you so misuse your talents.你如此滥用自己的才能，使我深感不安。
• He was sacked for computer misuse.他因滥用计算机而被解雇了。

206 thoroughly   

adv.完全地，彻底地，十足地

参考例句：

• The soil must be thoroughly turned over before planting.一定要先把土地深翻一遍再下种。
• The soldiers have been thoroughly instructed in the care of their weapons.士兵们都系统地接受过保护武器的训练。

207 nascent   

adj.初生的，发生中的

参考例句：

• That slim book showed the Chinese intelligentsia and the nascent working class.那本小册子讲述了中国的知识界和新兴的工人阶级。
• Despite a nascent democracy movement,there's little traction for direct suffrage.尽管有过一次新生的民主运动，但几乎不会带来直接选举。

208 brink   

n.(悬崖、河流等的)边缘，边沿

参考例句：

• The tree grew on the brink of the cliff.那棵树生长在峭壁的边缘。
• The two countries were poised on the brink of war.这两个国家处于交战的边缘。

209 imminence   

n.急迫，危急

参考例句：

• The imminence of their exams made them work harder.考试即将来临，迫使他们更用功了。
• He had doubt about the imminence of war.他不相信战争已迫在眉睫。

210 tingles   

n.刺痛感( tingle的名词复数 )v.有刺痛感( tingle的第三人称单数 )

参考例句：

• Something has been pressing on my leg and it tingles. 腿压麻了。 来自《现代汉英综合大词典》
• His cheek tingles from the slap she has given to him. 他的面颊因挨了她一记耳光而感到刺痛。 来自互联网

211 verge   

n.边，边缘；v.接近，濒临

参考例句：

• The country's economy is on the verge of collapse.国家的经济已到了崩溃的边缘。
• She was on the verge of bursting into tears.她快要哭出来了。

212 tingling   

v.有刺痛感( tingle的现在分词 )

参考例句：

• My ears are tingling [humming; ringing; singing]. 我耳鸣。 来自《现代汉英综合大词典》
• My tongue is tingling. 舌头发麻。 来自《现代汉英综合大词典》

213 speculation   

n.思索，沉思；猜测；投机

参考例句：

• Her mind is occupied with speculation.她的头脑忙于思考。
• There is widespread speculation that he is going to resign.人们普遍推测他要辞职。

214 weirdness   

n.古怪，离奇，不可思议

参考例句：

• The weirdness of the city by night held her attention. 夜间城市的古怪景象吸引了她的注意力。
• But that's not the end of the weirdness feasible in evolutionary systems. 然而这还不是进化系统居然可行的最怪异的地方呐。

215 syllables   

n.音节( syllable的名词复数 )

参考例句：

• a word with two syllables 双音节单词
• 'No. But I'll swear it was a name of two syllables.' “想不起。不过我可以发誓，它有两个音节。” 来自英汉文学 - 双城记

216 ascertained   

v.弄清，确定，查明( ascertain的过去式和过去分词 )

参考例句：

• The previously unidentified objects have now been definitely ascertained as being satellites. 原来所说的不明飞行物现在已证实是卫星。 来自《简明英汉词典》
• I ascertained that she was dead. 我断定她已经死了。 来自《简明英汉词典》

217 ascertainable   

adj.可确定（探知），可发现的

参考例句：

• Is the exact value of the missing jewels ascertainable? 那些不知去向之珠宝的确切价值弄得清楚吗？ 来自辞典例句
• Even a schoolboy's jape is supposed to have some ascertainable point. 即使一个小男生的戏言也可能有一些真义。 来自互联网

218 inaccessible   

adj.达不到的，难接近的

参考例句：

• This novel seems to me among the most inaccessible.这本书对我来说是最难懂的小说之一。
• The top of Mount Everest is the most inaccessible place in the world.珠穆朗玛峰是世界上最难到达的地方。

219 conclusively   

adv.令人信服地，确凿地

参考例句：

• All this proves conclusively that she couldn't have known the truth. 这一切无可置疑地证明她不可能知道真相。 来自《简明英汉词典》
• From the facts,he was able to determine conclusively that the death was not a suicide. 根据这些事实他断定这起死亡事件并非自杀。 来自《简明英汉词典》

220 component   

n.组成部分，成分，元件；adj.组成的，合成的

参考例句：

• Each component is carefully checked before assembly.每个零件在装配前都经过仔细检查。
• Blade and handle are the component parts of a knife.刀身和刀柄是一把刀的组成部分。

221 judgments   

判断( judgment的名词复数 )； 鉴定； 评价； 审判

参考例句：

• A peculiar austerity marked his judgments of modern life. 他对现代生活的批评带着一种特殊的苛刻。
• He is swift with his judgments. 他判断迅速。

222 varied   

adj.多样的，多变化的

参考例句：

• The forms of art are many and varied.艺术的形式是多种多样的。
• The hotel has a varied programme of nightly entertainment.宾馆有各种晚间娱乐活动。

223 renewal   

adj.(契约)延期，续订，更新，复活，重来

参考例句：

• Her contract is coming up for renewal in the autumn.她的合同秋天就应该续签了。
• Easter eggs symbolize the renewal of life.复活蛋象征新生。

224 acoustic   

adj.听觉的，声音的；(乐器)原声的

参考例句：

• The hall has a fine acoustic.这个大厅的传音效果很好。
• Animals use a whole rang of acoustic, visual,and chemical signals in their systems of communication.动物利用各种各样的听觉、视觉和化学信号来进行交流。

225 recollecting   

v.记起，想起( recollect的现在分词 )

参考例句：

• Once wound could heal slowly, my Bo Hui was recollecting. 曾经的伤口会慢慢地愈合，我卜会甾回忆。 来自互联网
• I am afraid of recollecting the life of past in the school. 我不敢回忆我在校过去的生活。 来自互联网

226 memorable   

adj.值得回忆的，难忘的，特别的，显著的

参考例句：

• This was indeed the most memorable day of my life.这的确是我一生中最值得怀念的日子。
• The veteran soldier has fought many memorable battles.这个老兵参加过许多难忘的战斗。

227 tenacious   

adj.顽强的，固执的，记忆力强的，粘的

参考例句：

• We must learn from the tenacious fighting spirit of Lu Xun.我们要学习鲁迅先生韧性的战斗精神。
• We should be tenacious of our rights.我们应坚决维护我们的权利。

228 brass   

n.黄铜；黄铜器，铜管乐器

参考例句：

• Many of the workers play in the factory's brass band.许多工人都在工厂铜管乐队中演奏。
• Brass is formed by the fusion of copper and zinc.黄铜是通过铜和锌的熔合而成的。

229 inscriptions   

（作者）题词( inscription的名词复数 )； 献词； 碑文； 证劵持有人的登记

参考例句：

• Centuries of wind and rain had worn away the inscriptions on the gravestones. 几个世纪的风雨已磨损了墓碑上的碑文。
• The inscriptions on the stone tablet have become blurred with the passage of time. 年代久了，石碑上的字迹已经模糊了。

230 moulders   

v.腐朽( moulder的第三人称单数 )；腐烂，崩塌

参考例句：

• Injection moulding without rejects is the ideal moulders try to attain. 避免不良品的注射成型是很多成型工艺员努力想达到的理想。 来自互联网
• That rotting inward slowly moulders all. 让它侵蚀就逐渐糜烂一切。 来自互联网

231 drawn   

v.拖，拉，拔出；adj.憔悴的，紧张的

参考例句：

• All the characters in the story are drawn from life.故事中的所有人物都取材于生活。
• Her gaze was drawn irresistibly to the scene outside.她的目光禁不住被外面的风景所吸引。

232 lasting   

adj.永久的，永恒的；vbl.持续，维持

参考例句：

• The lasting war debased the value of the dollar.持久的战争使美元贬值。
• We hope for a lasting settlement of all these troubles.我们希望这些纠纷能获得永久的解决。

233 omission   

n.省略，删节；遗漏或省略的事物，冗长

参考例句：

• The omission of the girls was unfair.把女孩排除在外是不公平的。
• The omission of this chapter from the third edition was a gross oversight.第三版漏印这一章是个大疏忽。

234 shipwreck   

n.船舶失事，海难

参考例句：

• He walked away from the shipwreck.他船难中平安地脱险了。
• The shipwreck was a harrowing experience.那次船难是一个惨痛的经历。

235 nonentity   

n.无足轻重的人

参考例句：

• She was written off then as a political nonentity.她当时被认定是成不了气候的政坛小人物。
• How could such a nonentity become chairman of the company? 这样的庸才怎么能当公司的董事长？

236 deficit   

n.亏空，亏损；赤字，逆差

参考例句：

• The directors have reported a deficit of 2.5 million dollars.董事们报告赤字为250万美元。
• We have a great deficit this year.我们今年有很大亏损。

237 abridgment   

n.删节，节本

参考例句：

• An abridgment of the book has been published for young readers.他们为年轻读者出版了这本书的节本。
• This abridgment provides a concise presentation of this masterpiece of Buddhist literature.这个删节本提供了简明介绍佛教文学的杰作。

238 prodigious   

adj.惊人的，奇妙的；异常的；巨大的；庞大的

参考例句：

• This business generates cash in prodigious amounts.这种业务收益丰厚。
• He impressed all who met him with his prodigious memory.他惊人的记忆力让所有见过他的人都印象深刻。

239 malady   

n.病，疾病(通常做比喻)

参考例句：

• There is no specific remedy for the malady.没有医治这种病的特效药。
• They are managing to control the malady into a small range.他们设法将疾病控制在小范围之内。

240 strenuous   

adj.奋发的，使劲的；紧张的；热烈的，狂热的

参考例句：

• He made strenuous efforts to improve his reading. 他奋发努力提高阅读能力。
• You may run yourself down in this strenuous week.你可能会在这紧张的一周透支掉自己。

241 possessed   

adj.疯狂的；拥有的，占有的

参考例句：

• He flew out of the room like a man possessed.他像着了魔似地猛然冲出房门。
• He behaved like someone possessed.他行为举止像是魔怔了。

242 intelligible   

adj.可理解的，明白易懂的，清楚的

参考例句：

• This report would be intelligible only to an expert in computing.只有计算机运算专家才能看懂这份报告。
• His argument was barely intelligible.他的论点不易理解。

243 determined   

adj.坚定的；有决心的

参考例句：

• I have determined on going to Tibet after graduation.我已决定毕业后去西藏。
• He determined to view the rooms behind the office.他决定查看一下办公室后面的房间。

244 pastor   

n.牧师，牧人

参考例句：

• He was the son of a poor pastor.他是一个穷牧师的儿子。
• We have no pastor at present:the church is run by five deacons.我们目前没有牧师：教会的事是由五位执事管理的。

245 inquiry   

n.打听，询问，调查，查问

参考例句：

• Many parents have been pressing for an inquiry into the problem.许多家长迫切要求调查这个问题。
• The field of inquiry has narrowed down to five persons.调查的范围已经缩小到只剩5个人了。

246 ransacked   

v.彻底搜查( ransack的过去式和过去分词 )；抢劫，掠夺

参考例句：

• The house had been ransacked by burglars. 这房子遭到了盗贼的洗劫。
• The house had been ransacked of all that was worth anything. 屋子里所有值钱的东西都被抢去了。 来自《现代英汉综合大词典》

247 personalities   

n. 诽谤，（对某人容貌、性格等所进行的）人身攻击； 人身攻击；人格, 个性, 名人( personality的名词复数 )

参考例句：

• There seemed to be a degree of personalities in her remarks.她话里有些人身攻击的成分。
• Personalities are not in good taste in general conversation.在一般的谈话中诽谤他人是不高尚的。

248 extravagant   

adj.奢侈的；过分的；(言行等)放肆的

参考例句：

• They tried to please him with fulsome compliments and extravagant gifts.他们想用溢美之词和奢华的礼品来取悦他。
• He is extravagant in behaviour.他行为放肆。

249 annihilated   

v.（彻底）消灭( annihilate的过去式和过去分词 )；使无效；废止；彻底击溃

参考例句：

• Our soldiers annihilated a force of three hundred enemy troops. 我军战士消灭了300名敌军。 来自《现代汉英综合大词典》
• We annihilated the enemy. 我们歼灭了敌人。 来自《简明英汉词典》

250 ego   

n.自我，自己，自尊

参考例句：

• He is absolute ego in all thing.在所有的事情上他都绝对自我。
• She has been on an ego trip since she sang on television.她上电视台唱过歌之后就一直自吹自擂。

251 cardinal   

n.(天主教的)红衣主教；adj.首要的，基本的

参考例句：

• This is a matter of cardinal significance.这是非常重要的事。
• The Cardinal coloured with vexation. 红衣主教感到恼火，脸涨得通红。

252 substantives   

n.作名词用的词或词组（substantive的复数形式）

参考例句：

253 aphasia   

n.失语症

参考例句：

• Unfortunately,he suffered from sudden onset of aphasia one week later.不幸的是，他术后一星期突然出现失语症。
• My wife is in B-four,stroke and aphasia.我的妻子住在B-4房间，患的是中风和失语症。

254 plight   

n.困境，境况，誓约，艰难；vt.宣誓，保证，约定

参考例句：

• The leader was much concerned over the plight of the refugees.那位领袖对难民的困境很担忧。
• She was in a most helpless plight.她真不知如何是好。

255 amnesic   

遗忘的； 失去记忆的； 失去存储的； 引起遗忘的

参考例句：

• They arrive back in the US amnesic for the period of brainwashing. 他们返抵美国后，由于洗脑忘记了那段时间发生了什么。
• The researchers tested four healthy individuals and four amnesic patients. 研究者测试了四个健康的人和四个失忆症患者。

256 discriminative   

有判别力

参考例句：

• The measures are non-discriminative and not targeted at Mexican citizens. 有关措施并非针对墨西哥公民，没有歧视性。
• The Discriminative Common Vector (DCV) successfully overcomes this problem for FLDA. 近年来针对此问题提出了不同的解决方法，其中基于共同鉴别矢量(DCV)的方法成功克服了已有各种方法存在的缺点，有较好的数值稳定性和较低的计算复杂度。

257 purblind   

adj.半盲的；愚笨的

参考例句：

• If an administrator has no access to information,it's as if he was purblind and hard of hearing and had a stuffed nose.做管理工作的人没有信息，就是耳目不灵，鼻子不通。
• Even his most purblind supporters knows this is nonsense.即使他最愚蠢的支持者也知道这是无稽之谈。

258 thereby   

adv.因此，从而

参考例句：

• I have never been to that city,,ereby I don't know much about it.我从未去过那座城市，因此对它不怎么熟悉。
• He became a British citizen,thereby gaining the right to vote.他成了英国公民，因而得到了投票权。

259 collation   

n.便餐；整理

参考例句：

• It was in this retreat that Mr. Quilp ordered a cold collation to be prepared.奎尔普先生就是在这个别墅里预定冷点的。
• I was quite taken with your line of photocopiers with collation and stapling capability.我被贵公司能够自动整理和装订的系列复印机吸引住了。

260 consecutive   

adj.连续的，联贯的，始终一贯的

参考例句：

• It has rained for four consecutive days.已连续下了四天雨。
• The policy of our Party is consecutive.我党的政策始终如一。

261 anatomy   

n.解剖学，解剖；功能，结构，组织

参考例句：

• He found out a great deal about the anatomy of animals.在动物解剖学方面，他有过许多发现。
• The hurricane's anatomy was powerful and complex.对飓风的剖析是一项庞大而复杂的工作。

262 ribs   

n.肋骨( rib的名词复数 )；（船或屋顶等的）肋拱；肋骨状的东西；（织物的）凸条花纹

参考例句：

• He suffered cracked ribs and bruising. 他断了肋骨还有挫伤。
• Make a small incision below the ribs. 在肋骨下方切开一个小口。

263 withdrawn   

vt.收回；使退出；vi.撤退，退出

参考例句：

• Our force has been withdrawn from the danger area.我们的军队已从危险地区撤出。
• All foreign troops should be withdrawn to their own countries.一切外国军队都应撤回本国去。

264 liberated   

a.无拘束的，放纵的

参考例句：

• The city was liberated by the advancing army. 军队向前挺进，解放了那座城市。
• The heat brings about a chemical reaction, and oxygen is liberated. 热量引起化学反应，释放出氧气。

265 conserved   

v.保护，保藏，保存( conserve的过去式和过去分词 )

参考例句：

• He conserved his energy for the game. 他为比赛而养精蓄锐。 来自《简明英汉词典》
• Under these conditions, the total mechanical energy remains constant, or is conserved. 在这种条件下，总机械能保持不变或机械能保存。 来自辞典例句

266 delicacy   

n.精致，细微，微妙，精良；美味，佳肴

参考例句：

• We admired the delicacy of the craftsmanship.我们佩服工艺师精巧的手艺。
• He sensed the delicacy of the situation.他感觉到了形势的微妙。

267 minimal   

adj.尽可能少的，最小的

参考例句：

• They referred to this kind of art as minimal art.他们把这种艺术叫微型艺术。
• I stayed with friends, so my expenses were minimal.我住在朋友家，所以我的花费很小。

268 withdrawal   

n.取回，提款；撤退，撤军；收回，撤销

参考例句：

• The police were forced to make a tactical withdrawal.警方被迫进行战术撤退。
• They insisted upon a withdrawal of the statement and a public apology.他们坚持要收回那些话并公开道歉。

269 obliteration   

n.涂去，删除；管腔闭合

参考例句：

• The policy is obliteration, openly acknowledged. 政策是彻底毁灭，公开承认的政策。 来自演讲部分
• "Obliteration is not a justifiable act of war" “彻底消灭并不是有理的战争行为” 来自演讲部分

270 peculiarity   

n.独特性，特色；特殊的东西；怪癖

参考例句：

• Each country has its own peculiarity.每个国家都有自己的独特之处。
• The peculiarity of this shop is its day and nigth service.这家商店的特点是昼夜服务。

271 groove   

n.沟，槽；凹线，（刻出的）线条，习惯

参考例句：

• They're happy to stay in the same old groove.他们乐于墨守成规。
• The cupboard door slides open along the groove.食橱门沿槽移开。

272 cognitive   

adj.认知的，认识的，有感知的

参考例句：

• As children grow older,their cognitive processes become sharper.孩子们越长越大，他们的认知过程变得更为敏锐。
• The cognitive psychologist is like the tinker who wants to know how a clock works.认知心理学者倒很像一个需要通晓钟表如何运转的钟表修理匠。

273 glimmer   

v.发出闪烁的微光；n.微光，微弱的闪光

参考例句：

• I looked at her and felt a glimmer of hope.我注视她，感到了一线希望。
• A glimmer of amusement showed in her eyes.她的眼中露出一丝笑意。

274 sensational   

adj.使人感动的，非常好的，轰动的，耸人听闻的

参考例句：

• Papers of this kind are full of sensational news reports.这类报纸满是耸人听闻的新闻报道。
• Their performance was sensational.他们的演出妙极了。

275 dependence   

n.依靠，依赖；信任，信赖；隶属

参考例句：

• Doctors keep trying to break her dependence of the drug.医生们尽力使她戒除毒瘾。
• He was freed from financial dependence on his parents.他在经济上摆脱了对父母的依赖。

276 unifying   

使联合( unify的现在分词 )； 使相同； 使一致； 统一

参考例句：

• In addition, there were certain religious bonds of a unifying kind. 此外，他们还有某种具有一种统一性质的宗教上的结合。
• There is a unifying theme, and that is the theme of information flow within biological systems. 我们可以用一个总的命题，把生物学系统内的信息流来作为这一研究主题。

277 imperatively   

adv.命令式地

参考例句：

• Drying wet rice rapidly and soaking or rewetting dry rice kernels imperatively results in severe fissuring. 潮湿米粒快速干燥或干燥籽粒浸水、回潮均会产生严重的裂纹。 来自互联网
• Drying wet rice kernels rapidly, Soaking or Rewetting dry rice Kernels imperatively results in severe fissuring. 潮湿米粒的快速干燥，干燥籽粒的浸水或回潮均会带来严重的裂纹。 来自互联网

278 precisely   

adv.恰好，正好，精确地，细致地

参考例句：

• It's precisely that sort of slick sales-talk that I mistrust.我不相信的正是那种油腔滑调的推销宣传。
• The man adjusted very precisely.那个人调得很准。

279 inexplicable   

adj.无法解释的，难理解的

参考例句：

• It is now inexplicable how that development was misinterpreted.当时对这一事态发展的错误理解究竟是怎么产生的，现在已经无法说清楚了。
• There are many things which are inexplicable by science.有很多事科学还无法解释。

280 cumulative   

adj.累积的，渐增的

参考例句：

• This drug has a cumulative effect.这种药有渐增的效力。
• The benefits from eating fish are cumulative.吃鱼的好处要长期才能显现。

281 utterly   

adv.完全地，绝对地

参考例句：

• Utterly devoted to the people,he gave his life in saving his patients.他忠于人民，把毕生精力用于挽救患者的生命。
• I was utterly ravished by the way she smiled.她的微笑使我完全陶醉了。

282 incapable   

adj.无能力的，不能做某事的

参考例句：

• He would be incapable of committing such a cruel deed.他不会做出这么残忍的事。
• Computers are incapable of creative thought.计算机不会创造性地思维。

283 reigning   

adj.统治的，起支配作用的

参考例句：

• The sky was dark, stars were twinkling high above, night was reigning, and everything was sunk in silken silence. 天很黑，星很繁，夜阑人静。
• Led by Huang Chao, they brought down the reigning house after 300 years' rule. 在黄巢的带领下，他们推翻了统治了三百年的王朝。

284 scattered   

adj.分散的，稀疏的；散步的；疏疏落落的

参考例句：

• Gathering up his scattered papers,he pushed them into his case.他把散乱的文件收拾起来，塞进文件夹里。

285 bibliographic   

书籍解题的，著书目录的

参考例句：

• Hall and Brown first define an on-line bibliographic data base as a collection of records. 霍尔和布朗首先把联机书目数据库定义为纪录集合。
• Neat notes especially count for bibliographic information and URLs. 对于书目和网址来说，整洁的笔记特别有价值。

286 monograph   

n.专题文章，专题著作

参考例句：

• This monograph belongs to the category of serious popular books.这本专著是一本较高深的普及读物。
• It's a monograph you wrote six years ago.这是你六年前写的的专论。