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II EARLY EXPERIMENTS
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So far, the stories of the development of flight are either legendary1 or of more or less doubtful authenticity2, even including that of Danti, who, although a man of remarkable3 attainments5 in more directions than that of attempted flight, suffers—so far as reputation is concerned—from the inexactitudes of his chroniclers; he may have soared over Thrasimene, as stated, or a mere6 hop7 with an ineffectual glider9 may have grown with the years to a legend of gliding10 flight. So far, too, there is no evidence of the study that the conquest of the air demanded; such men as made experiments either launched themselves in the air from some height with made-up wings or other apparatus11, and paid the penalty, or else constructed some form of machine which would not leave the earth, and then gave up. Each man followed his own way, and there was no attempt—without the printing press and the dissemination12 of knowledge there was little possibility of attempt—on the part of any one to benefit by the failures of others.

Legend and doubtful history carries up to the fifteenth century, and then came Leonardo da Vinci, first student of flight whose work endures to the present day. The world knows da Vinci as artist; his age knew him as architect, engineer, artist, and scientist16 in an age when science was a single study, comprising all knowledge from mathematics to medicine. He was, of course, in league with the devil, for in no other way could his range of knowledge and observation be explained by his contemporaries; he left a Treatise13 on the Flight of Birds in which are statements and deductions14 that had to be rediscovered when the Treatise had been forgotten—da Vinci anticipated modern knowledge as Plato anticipated modern thought, and blazed the first broad trail toward flight.

One Cuperus, who wrote a Treatise on the Excellence15 of Man, asserted that da Vinci translated his theories into practice, and actually flew, but the statement is unsupported. That he made models, especially on the helicopter principle, is past question; these were made of paper and wire, and actuated by springs of steel wire, which caused them to lift themselves in the air. It is, however, in the theories which he put forward that da Vinci’s investigations16 are of greatest interest; these prove him a patient as well as a keen student of the principles of flight, and show that his manifold activities did not prevent him from devoting some lengthy18 periods to observations of bird flight.

‘A bird,’ he says in his Treatise, ‘is an instrument working according to mathematical law, which instrument it is within the capacity of man to reproduce with all its movements, but not with a corresponding degree of strength, though it is deficient19 only in power of maintaining equilibrium20. We may say, therefore, that such an instrument constructed by man is lacking in nothing except the life of the bird, and this life must needs be supplied from that of man. The life which resides in the bird’s members will, without doubt,17 better conform to their needs than will that of a man which is separated from them, and especially in the almost imperceptible movements which produce equilibrium. But since we see that the bird is equipped for many apparent varieties of movement, we are able from this experience to deduce that the most rudimentary of these movements will be capable of being comprehended by man’s understanding, and that he will to a great extent be able to provide against the destruction of that instrument of which he himself has become the living principle and the propeller21.’

In this is the definite belief of da Vinci that man is capable of flight, together with a far more definite statement of the principles by which flight is to be achieved than any which had preceded it—and for that matter, than many that have succeeded it. Two further extracts from his work will show the exactness of his observations:—

‘When a bird which is in equilibrium throws the centre of resistance of the wings behind the centre of gravity, then such a bird will descend22 with its head downward. This bird which finds itself in equilibrium shall have the centre of resistance of the wings more forward than the bird’s centre of gravity; then such a bird will fall with its tail turned toward the earth.’

And again: ‘A man, when flying, shall be free from the waist up, that he may be able to keep himself in equilibrium as he does in a boat, so that the centre of his gravity and of the instrument may set itself in equilibrium and change when necessity requires it to the changing of the centre of its resistance.’

Here, in this last quotation23, are the first beginnings of the inherent stability which proved so great an18 advance in design, in this twentieth century. But the extracts given do not begin to exhaust the range of da Vinci’s observations and deductions. With regard to bird flight, he observed that so long as a bird keeps its wings outspread it cannot fall directly to earth, but must glide8 down at an angle to alight—a small thing, now that the principle of the plane in opposition24 to the air is generally grasped, but da Vinci had to find it out. From observation he gathered how a bird checks its own speed by opposing tail and wing surface to the direction of flight, and thus alights at the proper ‘landing speed.’ He proved the existence of upward air currents by noting how a bird takes off from level earth with wings outstretched and motionless, and, in order to get an efficient substitute for the natural wing, he recommended that there be used something similar to the membrane25 of the wing of a bat—from this to the doped fabric26 of an aeroplane wing is but a small step, for both are equally impervious27 to air. Again, da Vinci recommended that experiments in flight be conducted at a good height from the ground, since, if equilibrium be lost through any cause, the height gives time to regain28 it. This recommendation, by the way, received ample support in the training areas of war pilots.

Man’s muscles, said da Vinci, are fully29 sufficient to enable him to fly, for the larger birds, he noted30, employ but a small part of their strength in keeping themselves afloat in the air—by this theory he attempted to encourage experiment, just as, when his time came, Borelli reached the opposite conclusion and discouraged it. That Borelli was right—so far—and da Vinci wrong, detracts not at all from the repute of the earlier19 investigator31, who had but the resources of his age to support investigations conducted in the spirit of ages after.

His chief practical contributions to the science of flight—apart from numerous drawings which have still a value—are the helicopter or lifting screw, and the parachute. The former, as already noted, he made and proved effective in model form, and the principle which he demonstrated is that of the helicopter of to-day, on which sundry32 experimenters work spasmodically, in spite of the success of the plane with its driving propeller. As to the parachute, the idea was doubtless inspired by observation of the effect a bird produced by pressure of its wings against the direction of flight.

Da Vinci’s conclusions, and his experiments, were forgotten easily by most of his contemporaries; his Treatise lay forgotten for nearly four centuries, overshadowed, mayhap, by his other work. There was, however, a certain Paolo Guidotti of Lucca, who lived in the latter half of the sixteenth century, and who attempted to carry da Vinci’s theories—one of them, at least, into practice. For this Guidotti, who was by profession an artist and by inclination33 an investigator, made for himself wings, of which the framework was of whalebone; these he covered with feathers, and with them made a number of gliding flights, attaining34 considerable proficiency35. He is said in the end to have made a flight of about four hundred yards, but this attempt at solving the problem ended on a house roof, where Guidotti broke his thigh36 bone. After that, apparently37, he gave up the idea of flight, and went back to painting.

One other, a Venetian architect named Veranzio,20 studied da Vinci’s theory of the parachute, and found it correct, if contemporary records and even pictorial38 presentment are correct. Da Vinci showed his conception of a parachute as a sort of inverted39 square bag; Veranzio modified this to a ‘sort of square sail extended by four rods of equal size and having four cords attached at the corners,’ by means of which ‘a man could without danger throw himself from the top of a tower or any high place. For though at the moment there may be no wind, yet the effort of his falling will carry up the wind, which the sail will hold, by which means he does not fall suddenly but descends40 little by little. The size of the sail should be measured to the man.’ By this last, evidently, Veranzio intended to convey that the sheet must be of such content as would enclose sufficient air to support the weight of the parachutist.

Veranzio made his experiments about 1617–1618, but, naturally, they carried him no farther than the mere descent to earth, and since a descent is merely a descent, it is to be conjectured41 that he soon got tired of dropping from high roofs, and took to designing architecture instead of putting it to such a use. With the end of his experiments the work of da Vinci in relation to flying became neglected for nearly four centuries.

Apart from these two experimenters, there is little to record in the matter either of experiment or study until the seventeenth century. Francis Bacon, it is true, wrote about flying in his Sylva Sylvarum, and mentioned the subject in the New Atlantis, but, except for the insight that he showed even in superficial mention of any specific subject, he does not appear to have made attempt at serious investigation17. ‘Spreading of21 Feathers, thin and close and in great breadth will likewise bear up a great Weight,’ says Francis, ‘being even laid without Tilting42 upon the sides.’ But a lesser43 genius could have told as much, even in that age, and though the great Sir Francis is sometimes adduced as one of the early students of the problems of flight, his writings will not sustain the reputation.

The seventeenth century, however, gives us three names, those of Borelli, Lana, and Robert Hooke, all of which take definite place in the history of flight. Borelli ranks as one of the great figures in the study of aeronautical44 problems, in spite of erroneous deductions through which he arrived at a purely45 negative conclusion with regard to the possibility of human flight.

Borelli was a versatile46 genius. Born in 1608, he was practically contemporary with Francesco Lana, and there is evidence that he either knew or was in correspondence with many prominent members of the Royal Society of Great Britain, more especially with John Collins, Dr Wallis, and Henry Oldenburgh, the then Secretary of the Society. He was author of a long list of scientific essays, two of which only are responsible for his fame, viz., Theorice Medic?arum Planetarum, published in Florence, and the better known posthumous47 De Motu Animalium. The first of these two is an astronomical48 study in which Borelli gives evidence of an instinctive49 knowledge of gravitation, though no definite expression is given of this. The second work, De Motu Animalium, deals with the mechanical action of the limbs of birds and animals and with a theory of the action of the internal organs. A section of the first part of this work, called De Volatu, is a study of bird flight; it is quite independent of Da Vinci’s earlier22 work, which had been forgotten and remained unnoticed until near on the beginning of practical flight.

Marey, in his work, La Machine Animale, credits Borelli with the first correct idea of the mechanism50 of flight. He says: ‘Therefore we must be allowed to render to the genius of Borelli the justice which is due to him, and only claim for ourselves the merit of having furnished the experimental demonstration51 of a truth already suspected.’ In fact, all subsequent studies on this subject concur52 in making Borelli the first investigator who illustrated53 the purely mechanical theory of the action of a bird’s wings.

Borelli’s study is divided into a series of propositions in which he traces the principles of flight, and the mechanical actions of the wings of birds. The most interesting of these are the propositions in which he sets forth54 the method in which birds move their wings during flight and the manner in which the air offers resistance to the stroke of the wing. With regard to the first of these two points he says: ‘When birds in repose55 rest on the earth their wings are folded up close against their flanks, but when wishing to start on their flight they first bend their legs and leap into the air. Whereupon the joints56 of their wings are straightened out to form a straight line at right angles to the lateral57 surface of the breast, so that the two wings, outstretched, are placed, as it were, like the arms of a cross to the body of the bird. Next, since the wings with their feathers attached form almost a plane surface, they are raised slightly above the horizontal, and with a most quick impulse beat down in a direction almost perpendicular58 to the wing-plane, upon the underlying59 air; and to so intense a beat the air, notwithstanding it to be fluid,23 offers resistance, partly by reason of its natural inertia60, which seeks to retain it at rest, and partly because the particles of the air, compressed by the swiftness of the stroke, resist this compression by their elasticity62, just like the hard ground. Hence the whole mass of the bird rebounds63, making a fresh leap through the air; whence it follows that flight is simply a motion composed of successive leaps accomplished64 through the air. And I remark that a wing can easily beat the air in a direction almost perpendicular to its plane surface, although only a single one of the corners of the humerus bone is attached to the scapula, the whole extent of its base remaining free and loose, while the greater transverse feathers are joined to the lateral skin of the thorax. Nevertheless the wing can easily revolve65 about its base like unto a fan. Nor are there lacking tendon ligaments which restrain the feathers and prevent them from opening farther, in the same fashion that sheets hold in the sails of ships. No less admirable is nature’s cunning in unfolding and folding the wings upwards66, for she folds them not laterally67, but by moving upwards edgewise the osseous parts wherein the roots of the feathers are inserted; for thus, without encountering the air’s resistance the upward motion of the wing surface is made as with a sword, hence they can be uplifted with but small force. But thereafter when the wings are twisted by being drawn68 transversely and by the resistance of the air, they are flattened69 as has been declared and will be made manifest hereafter.’

Then with reference to the resistance to the air of the wings he explains: ‘The air when struck offers resistance by its elastic61 virtue70 through which the particles of the air compressed by the wing-beat strive to expand24 again. Through these two causes of resistance the downward beat of the wing is not only opposed, but even caused to recoil71 with a reflex movement; and these two causes of resistance ever increase the more the down stroke of the wing is maintained and accelerated. On the other hand, the impulse of the wing is continuously diminished and weakened by the growing resistance. Hereby the force of the wing and the resistance become balanced; so that, manifestly, the air is beaten by the wing with the same force as the resistance to the stroke.’

He concerns himself also with the most difficult problem that confronts the flying man of to-day, namely, landing effectively, and his remarks on this subject would be instructive even to an air pilot of these days: ‘Now the ways and means by which the speed is slackened at the end of a flight are these. The bird spreads its wings and tail so that their concave surfaces are perpendicular to the direction of motion; in this way, the spreading feathers, like a ship’s sail, strike against the still air, check the speed, and so that most of the impetus72 may be stopped, the wings are flapped quickly and strongly forward, inducing a contrary motion, so that the bird absolutely or very nearly stops.’

At the end of his study Borelli came to a conclusion which militated greatly against experiment with any heavier-than-air apparatus, until well on into the nineteenth century, for having gone thoroughly73 into the subject of bird flight he states distinctly in his last proposition on the subject that ‘It is impossible that men should be able to fly craftily74 by their own strength.’ This statement, of course, remains75 true up to the present day, for no man has yet devised the means by which25 he can raise himself in the air and maintain himself there by mere muscular effort.

From the time of Borelli up to the development of the steam engine it may be said that flight by means of any heavier-than-air apparatus was generally regarded as impossible, and apart from certain deductions which a little experiment would have shown to be doomed76 to failure, this method of flight was not followed up. It is not to be wondered at, when Borelli’s exaggerated estimate of the strength expended77 by birds in proportion to their weight is borne in mind; he alleged78 that the motive79 force in birds’ wings is 10,000 times greater than the resistance of their weight, and with regard to human flight he remarks:—

‘When, therefore, it is asked whether men may be able to fly by their own strength, it must be seen whether the motive power of the pectoral muscles (the strength of which is indicated and measured by their size) is proportionately great, as it is evident that it must exceed the resistance of the weight of the whole human body 10,000 times, together with the weight of enormous wings which should be attached to the arms. And it is clear that the motive power of the pectoral muscles in men is much less than is necessary for flight, for in birds the bulk and weight of the muscles for flapping the wings are not less than a sixth part of the entire weight of the body. Therefore, it would be necessary that the pectoral muscles of a man should weigh more than a sixth part of the entire weight of his body; so also the arms, by flapping with the wings attached, should be able to exert a power 10,000 times greater than the weight of the human body itself. But they are far below such excess, for the aforesaid pectoral26 muscles do not equal a hundredth part of the entire weight of a man. Wherefore either the strength of the muscles ought to be increased or the weight of the human body must be decreased, so that the same proportion obtains in it as exists in birds. Hence it is deducted80 that the Icarian invention is entirely81 mythical82 because impossible, for it is not possible either to increase a man’s pectoral muscles or to diminish the weight of the human body; and whatever apparatus is used, although it is possible to increase the momentum83, the velocity84 or the power employed can never equal the resistance; and therefore wing flapping by the contraction85 of muscles cannot give out enough power to carry up the heavy body of a man.’

It may be said that practically all the conclusions which Borelli reached in his study were negative. Although contemporary with Lana, he perceived the one factor which rendered Lana’s project for flight by means of vacuum globes an impossibility—he saw that no globe could be constructed sufficiently86 light for flight, and at the same time sufficiently strong to withstand the pressure of the outside atmosphere. He does not appear to have made any experiments in flying on his own account, having, as he asserts most definitely, no faith in any invention designed to lift man from the surface of the earth. But his work, from which only the foregoing short quotations87 can be given, is, nevertheless, of indisputable value, for he settled the mechanics of bird flight, and paved the way for those later investigators88 who had, first, the steam engine, and later the internal combustion89 engine—two factors in mechanical flight which would have seemed as impossible to Borelli as would wireless90 telegraphy to a student of27 Napoleonic times. On such foundations as his age afforded Borelli built solidly and well, so that he ranks as one of the greatest—if not actually the greatest—of the investigators into this subject before the age of steam.

The conclusion, that ‘the motive force in birds’ wings is apparently ten thousand times greater than the resistance of their weight,’ is erroneous, of course, but study of the translation from which the foregoing excerpt91 is taken will show that the error detracts very little from the value of the work itself. Borelli sets out very definitely the mechanism of flight, in such fashion that he who runs may read. His reference to ‘the use of a large vessel92,’ etc., concerns the suggestion made by Francesco Lana, who antedated93 Borelli’s publication of De Motu Animalium by some ten years with his suggestion for an ‘aerial ship,’ as he called it. Lana’s mind shows, as regards flight, a more imaginative twist; Borelli dived down into first causes, and reached mathematical conclusions; Lana conceived a theory and upheld it—theoretically, since the manner of his life precluded94 experiment.

Francesco Lana, son of a noble family, was born in 1631; in 1647 he was received as a novice95 into the Society of Jesus at Rome, and remained a pious96 member of the Jesuit society until the end of his life. He was greatly handicapped in his scientific investigations by the vows97 of poverty which the rules of the Order imposed on him. He was more scientist than priest all his life; for two years he held the post of Professor of Mathematics at Ferrara, and up to the time of his death, in 1687, he spent by far the greater part of his time in scientific research. He had the dubious98 advantage of living in28 an age when one man could cover the whole range of science, and this he seems to have done very thoroughly. There survives an immense work of his entitled, Magisterium Natur? et Artis, which embraces the whole field of scientific knowledge as that was developed in the period in which Lana lived. In an earlier work of his, published in Brescia in 1670, appears his famous treatise on the aerial ship, a problem which Lana worked out with thoroughness. He was unable to make practical experiments, and thus failed to perceive the one insuperable drawback to his project—of which more anon.

Only extracts from the translation of Lana’s work can be given here, but sufficient can be given to show fully the means by which he designed to achieve the conquest of the air. He begins by mention of the celebrated99 pigeon of Archytas the Philosopher, and advances one or two theories with regard to the way in which this mechanical bird was constructed, and then he recites, apparently with full belief in it, the fable100 of Regiomontanus and the eagle that he is said to have constructed to accompany Charles V. on his entry into Nuremberg. In fact, Lana starts his work with a study of the pioneers of mechanical flying up to his own time, and then outlines his own devices for the construction of mechanical birds before proceeding101 to detail the construction of the aerial ship. Concerning primary experiments for this he says:—

‘I will, first of all, presuppose that air has weight owing to the vapours and halations which ascend102 from the earth and seas to a height of many miles and surround the whole of our terraqueous globe; and this fact will not be denied by philosophers, even by those who may have but a superficial knowledge, because it can be29 proven by exhausting, if not all, at any rate the greater part of, the air contained in a glass vessel, which, if weighed before and after the air has been exhausted103, will be found materially reduced in weight. Then I found out how much the air weighed in itself in the following manner. I procured104 a large vessel of glass, whose neck could be closed or opened by means of a tap, and holding it open I warmed it over a fire, so that the air inside it becoming rarified, the major part was forced out; then quickly shutting the tap to prevent the re-entry I weighed it; which done, I plunged105 its neck in water, resting the whole of the vessel on the surface of the water, then on opening the tap the water rose in the vessel and filled the greater part of it. I lifted the neck out of the water, released the water contained in the vessel, and measured and weighed its quantity and density106, by which I inferred that a certain quantity of air had come out of the vessel equal in bulk to the quantity of water which had entered to refill the portion abandoned by the air. I again weighed the vessel, after I had first of all well dried it free of all moisture, and found it weighed one ounce more whilst it was full of air than when it was exhausted of the greater part, so that what it weighed more was a quantity of air equal in volume to the water which took its place. The water weighed 640 ounces, so I concluded that the weight of air compared with that of water was 1 to 640—that is to say, as the water which filled the vessel weighed 640 ounces, so the air which filled the same vessel weighed one ounce.’

Having thus detailed107 the method of exhausting air from a vessel, Lana goes on to assume that any large vessel can be entirely exhausted of nearly all the air30 contained therein. Then he takes Euclid’s proposition to the effect that the superficial area of globes increases in the proportion of the square of the diameter, whilst the volume increases in the proportion of the cube of the same diameter, and he considers that if one only constructs the globe of thin metal, of sufficient size, and exhausts the air in the manner that he suggests, such a globe will be so far lighter108 than the surrounding atmosphere that it will not only rise, but will be capable of lifting weights. Here is Lana’s own way of putting it:—

‘But so that it may be enabled to raise heavier weights and to lift men in the air, let us take double the quantity of copper109, 1,232 square feet, equal to 308 lbs. of copper; with this double quantity of copper we could construct a vessel of not only double the capacity, but of four times the capacity of the first, for the reason shown by my fourth supposition. Consequently the air contained in such a vessel will be 718 lbs. 4? ounces, so that if the air be drawn out of the vessel it will be 410 lbs. 4? ounces lighter than the same volume of air, and, consequently, will be enabled to lift three men, or at least two, should they weigh more than eight pesi each. It is thus manifest that the larger the ball or vessel is made, the thicker and more solid can the sheets of copper be made, because, although the weight will increase, the capacity of the vessel will increase to a greater extent and with it the weight of the air therein, so that it will always be capable to lift a heavier weight. From this it can be easily seen how it is possible to construct a machine which, fashioned like unto a ship, will float on the air.’
A suggestion for applying hydrogen gas to Lana’s ‘Aerial Ship.’ Rome, 1784.

With four globes of these dimensions Lana proposed31 to make an aerial ship of the fashion shown in his quaint110 illustration. He is careful to point out a method by which the supporting globes for the aerial ship may be entirely emptied of air; this is to be done by connecting to each globe a tube of copper which is ‘at least a length of 47 modern Roman palmi.’ A small tap is to close this tube at the end nearest the globe, and then vessel and tube are to be filled with water, after which the tube is to be immersed in water and the tap opened, allowing the water to run out of the vessel, while no air enters. The tap is then closed before the lower end of the tube is removed from the water, leaving no air at all in the globe or sphere. Propulsion of this airship was to be accomplished by means of sails, and also by oars111.

Lana antedated the modern propeller, and realised that the air would offer enough resistance to oars or paddle to impart motion to any vessel floating in it and propelled by these means, although he did not realise the amount of pressure on the air which would be necessary to accomplish propulsion. As a matter of fact, he foresaw and provided against practically all the difficulties that would be encountered in the working, as well as the making, of the aerial ship, finally coming up against what his religious training made an insuperable objection. This, again, is best told in his own words:—

‘Other difficulties I do not foresee that could prevail against this invention, save one only, which to me seems the greatest of them all, and that is that God would surely never allow such a machine to be successful, since it would create many disturbances112 in the civil and political governments of mankind.’

He ends by saying that no city would be proof32 against surprise, while the aerial ship could set fire to vessels113 at sea, and destroy houses, fortresses114, and cities by fire balls and bombs. In fact, at the end of his treatise on the subject, he furnishes a pretty complete résumé of the activities of German Zeppelins.

As already noted, Lana himself, owing to his vows of poverty, was unable to do more than put his suggestions on paper, which he did with a thoroughness that has procured him a place among the really great pioneers of flying.

It was nearly 200 years before any attempt was made to realise his project; then, in 1843, M. Marey Monge set out to make the globes and the ship as Lana detailed them. Monge’s experiments cost him the sum of 25,000 francs 75 centimes, which he expended purely from love of scientific investigation. He chose to make his globes of brass115, about .004 in thickness, and weighing 1.465 lbs. to the square yard. Having made his sphere of this metal, he lined it with two thicknesses of tissue paper, varnished116 it with oil, and set to work to empty it of air. This, however, he never achieved, for such metal is incapable117 of sustaining the pressure of the outside air, as Lana, had he had the means to carry out experiments, would have ascertained118. M. Monge’s sphere could never be emptied of air sufficiently to rise from the earth; it ended in the melting-pot, ignominiously119 enough, and all that Monge got from his experiment was the value of the scrap120 metal and the satisfaction of knowing that Lana’s theory could never be translated into practice.

Robert Hooke is less conspicuous121 than either Borelli or Lana; his work, which came into the middle of the seventeenth century, consisted of various experiments33 with regard to flight, from which emerged ‘a Module122, which by the help of Springs and Wings, raised and sustained itself in the air.’ This must be reckoned as the first model flying machine which actually flew, except for da Vinci’s helicopters; Hooke’s model appears to have been of the flapping-wing type—he attempted to copy the motion of birds, but found from study and experiment that human muscles were not sufficient to the task of lifting the human body. For that reason, he says, ‘I applied123 my mind to contrive124 a way to make artificial muscles,’ but in this he was, as he expresses it, ‘frustrated of my expectations.’ Hooke’s claim to fame rests mainly on his successful model; the rest of his work is of too scrappy a nature to rank as a serious contribution to the study of flight.

Contemporary with Hooke was one Allard, who, in France, undertook to emulate125 the Saracen of Constantinople to a certain extent. Allard was a tight-rope dancer who either did or was said to have done short gliding flights—the matter is open to question—and finally stated that he would, at St Germains, fly from the terrace in the king’s presence. He made the attempt, but merely fell, as did the Saracen some centuries before, causing himself serious injury. Allard cannot be regarded as a contributor to the development of aeronautics126 in any way, and is only mentioned as typical of the way in which, up to the time of the Wright brothers, flying was regarded. Even unto this day there are many who still believe that, with a pair of wings, man ought to be able to fly, and that the mathematical data necessary to effective construction simply do not exist. This attitude was reasonable enough in an unlearned age, and Allard was one—a little more conspicuous34 than the majority—among many who made experiment in ignorance, with more or less danger to themselves and without practical result of any kind.
Besnier’s Flying Apparatus.

The seventeenth century was not to end, however, without practical experiment of a noteworthy kind in gliding flight. Among the recruits to the ranks of pioneers was a certain Besnier, a locksmith of Sablé, who somewhere between 1675 and 1680 constructed a glider of which a crude picture has come down to modern times. The apparatus, as will be seen, consisted of two rods with hinged flaps, and the original designer of the picture seems to have had but a small space in which to draw, since obviously the flaps must have been much larger than those shown. Besnier placed the rods on his shoulders, and worked the flaps by cords attached to his hands and feet—the flaps opened as they fell, and closed as they rose, so the device as a whole must be regarded as a sort of flapping glider. Having by experiment proved his apparatus successful,35 Besnier promptly128 sold it to a travelling showman of the period, and forthwith set about constructing a second set, with which he made gliding flights of considerable height and distance. Like Lilienthal, Besnier projected himself into space from some height, and then, according to the contemporary records, he was able to cross a river of considerable size before coming to earth. It does not appear that he had any imitators, or that any advantage whatever was taken of his experiments; the age was one in which he would be regarded rather as a freak exhibitor than as a serious student, and possibly, considering his origin and the sale of his first apparatus to such a client, he regarded the matter himself as more in the nature of an amusement than as a discovery.

Borelli, coming at the end of the century, proved to his own satisfaction and that of his fellows that flapping wing flight was an impossibility; the capabilities129 of the plane were as yet undreamed, and the prime mover that should make the plane available for flight was deep in the womb of time. Da Vinci’s work was forgotten—flight was an impossibility, or at best such a useless show as Besnier was able to give.

The eighteenth century was almost barren of experiment. Emanuel Swedenborg, having invented a new religion, set about inventing a flying machine, and succeeded theoretically, publishing the result of his investigations as follows:—

‘Let a car or boat or some like object be made of light material such as cork130 or bark, with a room within it for the operator. Secondly131, in front as well as behind, or all round, set a widely-stretched sail parallel to the machine, forming within a hollow or bend, which could36 be reefed like the sails of a ship. Thirdly, place wings on the sides, to be worked up and down by a spiral spring, these wings also to be hollow below in order to increase the force and velocity, take in the air, and make the resistance as great as may be required. These, too, should be of light material and of sufficient size; they should be in the shape of birds’ wings, or the sails of a windmill, or some such shape, and should be tilted132 obliquely133 upwards, and made so as to collapse134 on the upward stroke and expand on the downward. Fourth, place a balance or beam below, hanging down perpendicularly135 for some distance with a small weight attached to its end, pendent exactly in line with the centre of gravity; the longer this beam is, the lighter must it be, for it must have the same proportion as the well-known vectis or steel-yard. This would serve to restore the balance of the machine if it should lean over to any of the four sides. Fifthly, the wings would perhaps have greater force, so as to increase the resistance and make the flight easier, if a hood136 or shield were placed over them, as is the case with certain insects. Sixthly, when the sails are expanded so as to occupy a great surface and much air, with a balance keeping them horizontal, only a small force would be needed to move the machine back and forth in a circle, and up and down. And, after it has gained momentum to move slowly upwards, a slight movement and an even bearing would keep it balanced in the air and would determine its direction at will.’

The only point in this worthy127 of any note is the first device for maintaining stability automatically—Swedenborg certainly scored a point there. For the rest, his theory was but theory, incapable of being put37 to practice—he does not appear to have made any attempt at advance beyond the mere suggestion.

Some ten years before his time the state of knowledge with regard to flying in Europe was demonstrated by an order granted by the King of Portugal to Friar Lourenzo de Guzman, who claimed to have invented a flying machine capable of actual flight. The order stated that ‘In order to encourage the suppliant137 to apply himself with zeal138 toward the improvement of the new machine, which is capable of producing the effects mentioned by him, I grant unto him the first vacant place in my College of Barcelos or Santarem, and the first professorship of mathematics in my University of Coimbra, with the annual pension of 600,000 reis during his life.—Lisbon, 17th of March, 1709.’

What happened to Guzman when the non-existence of the machine was discovered is one of the things that is well outside the province of aeronautics. He was charlatan139 pure and simple, as far as actual flight was concerned, though he had some ideas respecting the design of hot-air balloons, according to Tissandier. (La Navigation Aerienne.) His flying machine was to contain, among other devices, bellows140 to produce artificial wind when the real article failed, and also magnets in globes to draw the vessel in an upward direction and maintain its buoyancy. Some draughtsman, apparently gifted with as vivid imagination as Guzman himself, has given to the world an illustration of the hypothetical vessel; it bears some resemblance to Lana’s aerial ship, from which fact one draws obvious conclusions.

A rather amusing claim to solving the problem of flight was made in the middle of the eighteenth century38 by one Grimaldi, a ‘famous and unique Engineer’ who, as a matter of actual fact, spent twenty years in missionary141 work in India, and employed the spare time that missionary work left him in bringing his invention to a workable state. The invention is described as a ‘box which with the aid of clockwork rises in the air, and goes with such lightness and strong rapidity that it succeeds in flying a journey of seven leagues in an hour. It is made in the fashion of a bird; the wings from end to end are 25 feet in extent. The body is composed of cork, artistically142 joined together and well fastened with metal wire, covered with parchment and feathers. The wings are made of catgut and whalebone, and covered also with the same parchment and feathers, and each wing is folded in three seams. In the body of the machine are contained thirty wheels of unique work, with two brass globes and little chains which alternately wind up a counterpoise; with the aid of six brass vases, full of a certain quantity of quicksilver, which run in some pulleys, the machine is kept by the artist in due equilibrium and balance. By means, then, of the friction143 between a steel wheel adequately tempered and a very heavy and surprising piece of lodestone, the whole is kept in a regulated forward movement, given, however, a right state of the winds, since the machine cannot fly so much in totally calm weather as in stormy. This prodigious144 machine is directed and guided by a tail seven palmi long, which is attached to the knees and ankles of the inventor by leather straps145; by stretching out his legs, either to the right or to the left, he moves the machine in whichever direction he pleases.... The machine’s flight lasts only three hours, after which the wings gradually close39 themselves, when the inventor, perceiving this, goes down gently, so as to get on his own feet, and then winds up the clockwork and gets himself ready again upon the wings for the continuation of a new flight. He himself told us that if by chance one of the wheels came off or if one of the wings broke, it is certain he would inevitably146 fall rapidly to the ground, and, therefore, he does not rise more than the height of a tree or two, as also he only once put himself in the risk of crossing the sea, and that was from Calais to Dover, and the same morning he arrived in London.’

And yet there are still quite a number of people who persist in stating that Bleriot was the first man to fly across the Channel!

A study of the development of the helicopter principle was published in France in 1868, when the great French engineer Paucton produced his Théorie de la Vis d’Archiméde. For some inexplicable147 reason, Paucton was not satisfied with the term ‘helicopter,’ but preferred to call it a ‘ptérophore,’ a name which, so far as can be ascertained, has not been adopted by any other writer or investigator. Paucton stated that, since a man is capable of sufficient force to overcome the weight of his own body, it is only necessary to give him a machine which acts on the air ‘with all the force of which it is capable and at its utmost speed,’ and he will then be able to lift himself in the air, just as by the exertion148 of all his strength he is able to lift himself in water. ‘It would seem,’ says Paucton, ‘that in the ptérophore, attached vertically149 to a carriage, the whole built lightly and carefully assembled, he has found something that will give him this result in all perfection. In construction, one would be careful that the machine40 produced the least friction possible, and naturally it ought to produce little, as it would not be at all complicated. The new D?dalus, sitting comfortably in his carriage, would by means of a crank give to the ptérophore a suitable circular (or revolving) speed. This single ptérophore would lift him vertically, but in order to move horizontally he should be supplied with a tail in the shape of another ptérophore. When he wished to stop for a little time, valves fixed150 firmly across the end of the space between the blades would automatically close the openings through which the air flows, and change the ptérophore into an unbroken surface which would resist the flow of air and retard151 the fall of the machine to a considerable degree.’

The doctrine152 thus set forth might appear plausible153, but it is based on the common misconception that all the force which might be put into the helicopter or ‘ptérophore’ would be utilised for lifting or propelling the vehicle through the air, just as a propeller uses all its power to drive a ship through water. But, in applying such a propelling force to the air, most of the force is utilised in maintaining aerodynamic support—as a matter of fact, more force is needed to maintain this support than the muscle of man could possibly furnish to a lifting screw, and even if the helicopter were applied to a full-sized, engine-driven air vehicle, the rate of ascent154 would depend on the amount of surplus power that could be carried. For example, an upward lift of 1,000 pounds from a propeller 15 feet in diameter would demand an expenditure155 of 50 horse-power under the best possible conditions, and in order to lift this load vertically through such atmospheric156 pressure as exists41 at sea-level or thereabouts, an additional 20 horse-power would be required to attain4 a rate of 11 feet per second—50 horse-power must be continually provided for the mere support of the load, and the additional 20 horse-power must be continually provided in order to lift it. Although, in model form, there is nothing quite so strikingly successful as the helicopter in the range of flying machines, yet the essential weight increases so disproportionately to the effective area that it is necessary to go but very little beyond model dimensions for the helicopter to become quite ineffective.

That is not to say that the lifting screw must be totally ruled out so far as the construction of aircraft is concerned. Much is still empirical, so far as this branch of aeronautics is concerned, and consideration of the structural157 features of a propeller goes to show that the relations of essential weight and effective area do not altogether apply in practice as they stand in theory. Paucton’s dream, in some modified form, may yet become reality—it is only so short a time ago as 1896 that Lord Kelvin stated he had not the smallest molecule158 of faith in aerial navigation, and since the whole history of flight consists in proving the impossible possible, the helicopter may yet challenge the propelled plane surface for aerial supremacy159.

It does not appear that Paucton went beyond theory, nor is there in his theory any advance toward practical flight—da Vinci could have told him as much as he knew. He was followed by Meerwein, who invented an apparatus apparently something between a flapping wing machine and a glider, consisting of two wings, which were to be operated by means of a rod; the venturesome one who would fly by means of this42 apparatus had to lie in a horizontal position beneath the wings to work the rod. Meerwein deserves a place of mention, however, by reason of his investigations into the amount of surface necessary to support a given weight. Taking that weight at 200 pounds—which would allow for the weight of a man and a very light apparatus—he estimated that 126 square feet would be necessary for support. His pamphlet, published at Basle in 1784, shows him to have been a painstaking160 student of the potentialities of flight.

Jean-Pierre Blanchard, later to acquire fame in connection with balloon flight, conceived and described a curious vehicle, of which he even announced trials as impending161. His trials were postponed162 time after time, and it appears that he became convinced in the end of the futility163 of his device, being assisted to such a conclusion by Lalande, the astronomer164, who repeated Borelli’s statement that it was impossible for man ever to fly by his own strength. This was in the closing days of the French monarchy165, and the ascent of the Mongolfiers’ first hot-air balloon in 1783—which shall be told more fully in its place—put an end to all French experiments with heavier-than-air apparatus, though in England the genius of Cayley was about to bud, and even in France there were those who understood that ballooning was not true flight.

点击收听单词发音收听单词发音  

1 legendary u1Vxg     
adj.传奇(中)的,闻名遐迩的;n.传奇(文学)
参考例句:
  • Legendary stories are passed down from parents to children.传奇故事是由父母传给孩子们的。
  • Odysseus was a legendary Greek hero.奥狄修斯是传说中的希腊英雄。
2 authenticity quyzq     
n.真实性
参考例句:
  • There has been some debate over the authenticity of his will. 对于他的遗嘱的真实性一直有争论。
  • The museum is seeking an expert opinion on the authenticity of the painting. 博物馆在请专家鉴定那幅画的真伪。
3 remarkable 8Vbx6     
adj.显著的,异常的,非凡的,值得注意的
参考例句:
  • She has made remarkable headway in her writing skills.她在写作技巧方面有了长足进步。
  • These cars are remarkable for the quietness of their engines.这些汽车因发动机没有噪音而不同凡响。
4 attain HvYzX     
vt.达到,获得,完成
参考例句:
  • I used the scientific method to attain this end. 我用科学的方法来达到这一目的。
  • His painstaking to attain his goal in life is praiseworthy. 他为实现人生目标所下的苦功是值得称赞的。
5 attainments 3f47ba9938f08311bdf016e1de15e082     
成就,造诣; 获得( attainment的名词复数 ); 达到; 造诣; 成就
参考例句:
  • a young woman of impressive educational attainments 一位学业成就斐然的年轻女子
  • He is a scholar of the highest attainments in this field. 他在这一领域是一位颇有造就的学者。
6 mere rC1xE     
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。
7 hop vdJzL     
n.单脚跳,跳跃;vi.单脚跳,跳跃;着手做某事;vt.跳跃,跃过
参考例句:
  • The children had a competition to see who could hop the fastest.孩子们举行比赛,看谁单足跳跃最快。
  • How long can you hop on your right foot?你用右脚能跳多远?
8 glide 2gExT     
n./v.溜,滑行;(时间)消逝
参考例句:
  • We stood in silence watching the snake glide effortlessly.我们噤若寒蝉地站着,眼看那条蛇逍遥自在地游来游去。
  • So graceful was the ballerina that she just seemed to glide.那芭蕾舞女演员翩跹起舞,宛如滑翔。
9 glider wgNxU     
n.滑翔机;滑翔导弹
参考例句:
  • The glider was soaring above the valley.那架滑翔机在山谷上空滑翔。
  • The pilot managed to land the glider on a safe place.那个驾驶员设法让滑翔机着陆到一个安全的地方。
10 gliding gliding     
v. 滑翔 adj. 滑动的
参考例句:
  • Swans went gliding past. 天鹅滑行而过。
  • The weather forecast has put a question mark against the chance of doing any gliding tomorrow. 天气预报对明天是否能举行滑翔表示怀疑。
11 apparatus ivTzx     
n.装置,器械;器具,设备
参考例句:
  • The school's audio apparatus includes films and records.学校的视听设备包括放映机和录音机。
  • They had a very refined apparatus.他们有一套非常精良的设备。
12 dissemination dissemination     
传播,宣传,传染(病毒)
参考例句:
  • The dissemination of error does people great harm. 谬种流传,误人不浅。
  • He was fully bent upon the dissemination of Chinese culture all over the world. 他一心致力于向全世界传播中国文化。
13 treatise rpWyx     
n.专著;(专题)论文
参考例句:
  • The doctor wrote a treatise on alcoholism.那位医生写了一篇关于酗酒问题的论文。
  • This is not a treatise on statistical theory.这不是一篇有关统计理论的论文。
14 deductions efdb24c54db0a56d702d92a7f902dd1f     
扣除( deduction的名词复数 ); 结论; 扣除的量; 推演
参考例句:
  • Many of the older officers trusted agents sightings more than cryptanalysts'deductions. 许多年纪比较大的军官往往相信特务的发现,而不怎么相信密码分析员的推断。
  • You know how you rush at things,jump to conclusions without proper deductions. 你知道你处理问题是多么仓促,毫无合适的演绎就仓促下结论。
15 excellence ZnhxM     
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。
16 investigations 02de25420938593f7db7bd4052010b32     
(正式的)调查( investigation的名词复数 ); 侦查; 科学研究; 学术研究
参考例句:
  • His investigations were intensive and thorough but revealed nothing. 他进行了深入彻底的调查,但没有发现什么。
  • He often sent them out to make investigations. 他常常派他们出去作调查。
17 investigation MRKzq     
n.调查,调查研究
参考例句:
  • In an investigation,a new fact became known, which told against him.在调查中新发现了一件对他不利的事实。
  • He drew the conclusion by building on his own investigation.他根据自己的调查研究作出结论。
18 lengthy f36yA     
adj.漫长的,冗长的
参考例句:
  • We devoted a lengthy and full discussion to this topic.我们对这个题目进行了长时间的充分讨论。
  • The professor wrote a lengthy book on Napoleon.教授写了一部有关拿破仑的巨著。
19 deficient Cmszv     
adj.不足的,不充份的,有缺陷的
参考例句:
  • The crops are suffering from deficient rain.庄稼因雨量不足而遭受损害。
  • I always have been deficient in selfconfidence and decision.我向来缺乏自信和果断。
20 equilibrium jiazs     
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。
21 propeller tRVxe     
n.螺旋桨,推进器
参考例句:
  • The propeller started to spin around.螺旋桨开始飞快地旋转起来。
  • A rope jammed the boat's propeller.一根绳子卡住了船的螺旋桨。
22 descend descend     
vt./vi.传下来,下来,下降
参考例句:
  • I hope the grace of God would descend on me.我期望上帝的恩惠。
  • We're not going to descend to such methods.我们不会沦落到使用这种手段。
23 quotation 7S6xV     
n.引文,引语,语录;报价,牌价,行情
参考例句:
  • He finished his speech with a quotation from Shakespeare.他讲话结束时引用了莎士比亚的语录。
  • The quotation is omitted here.此处引文从略。
24 opposition eIUxU     
n.反对,敌对
参考例句:
  • The party leader is facing opposition in his own backyard.该党领袖在自己的党內遇到了反对。
  • The police tried to break down the prisoner's opposition.警察设法制住了那个囚犯的反抗。
25 membrane H7ez8     
n.薄膜,膜皮,羊皮纸
参考例句:
  • A vibrating membrane in the ear helps to convey sounds to the brain.耳膜的振动帮助声音传送到大脑。
  • A plastic membrane serves as selective diffusion barrier.一层塑料薄膜起着选择性渗透屏障的作用。
26 fabric 3hezG     
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。
27 impervious 2ynyU     
adj.不能渗透的,不能穿过的,不易伤害的
参考例句:
  • He was completely impervious to criticism.他对批评毫不在乎。
  • This material is impervious to gases and liquids.气体和液体都透不过这种物质。
28 regain YkYzPd     
vt.重新获得,收复,恢复
参考例句:
  • He is making a bid to regain his World No.1 ranking.他正为重登世界排名第一位而努力。
  • The government is desperate to regain credibility with the public.政府急于重新获取公众的信任。
29 fully Gfuzd     
adv.完全地,全部地,彻底地;充分地
参考例句:
  • The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气,然后全部呼出。
  • They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。
30 noted 5n4zXc     
adj.著名的,知名的
参考例句:
  • The local hotel is noted for its good table.当地的那家酒店以餐食精美而著称。
  • Jim is noted for arriving late for work.吉姆上班迟到出了名。
31 investigator zRQzo     
n.研究者,调查者,审查者
参考例句:
  • He was a special investigator for the FBI.他是联邦调查局的特别调查员。
  • The investigator was able to deduce the crime and find the criminal.调查者能够推出犯罪过程并锁定罪犯。
32 sundry CswwL     
adj.各式各样的,种种的
参考例句:
  • This cream can be used to treat sundry minor injuries.这种药膏可用来治各种轻伤。
  • We can see the rich man on sundry occasions.我们能在各种场合见到那个富豪。
33 inclination Gkwyj     
n.倾斜;点头;弯腰;斜坡;倾度;倾向;爱好
参考例句:
  • She greeted us with a slight inclination of the head.她微微点头向我们致意。
  • I did not feel the slightest inclination to hurry.我没有丝毫着急的意思。
34 attaining da8a99bbb342bc514279651bdbe731cc     
(通常经过努力)实现( attain的现在分词 ); 达到; 获得; 达到(某年龄、水平、状况)
参考例句:
  • Jim is halfway to attaining his pilot's licence. 吉姆就快要拿到飞行员执照了。
  • By that time she was attaining to fifty. 那时她已快到五十岁了。
35 proficiency m1LzU     
n.精通,熟练,精练
参考例句:
  • He plied his trade and gained proficiency in it.他勤习手艺,技术渐渐达到了十分娴熟的地步。
  • How do you think of your proficiency in written and spoken English?你认为你的书面英语和口语熟练程度如何?
36 thigh RItzO     
n.大腿;股骨
参考例句:
  • He is suffering from a strained thigh muscle.他的大腿肌肉拉伤了,疼得很。
  • The thigh bone is connected to the hip bone.股骨连着髋骨。
37 apparently tMmyQ     
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。
38 pictorial PuWy6     
adj.绘画的;图片的;n.画报
参考例句:
  • The had insisted on a full pictorial coverage of the event.他们坚持要对那一事件做详尽的图片报道。
  • China Pictorial usually sells out soon after it hits the stands.《人民画报》往往一到报摊就销售一空。
39 inverted 184401f335d6b8661e04dfea47b9dcd5     
adj.反向的,倒转的v.使倒置,使反转( invert的过去式和过去分词 )
参考例句:
  • Only direct speech should go inside inverted commas. 只有直接引语应放在引号内。
  • Inverted flight is an acrobatic manoeuvre of the plane. 倒飞是飞机的一种特技动作。 来自《简明英汉词典》
40 descends e9fd61c3161a390a0db3b45b3a992bee     
v.下来( descend的第三人称单数 );下去;下降;下斜
参考例句:
  • This festival descends from a religious rite. 这个节日起源于宗教仪式。 来自《简明英汉词典》
  • The path descends steeply to the village. 小路陡直而下直到村子。 来自《简明英汉词典》
41 conjectured c62e90c2992df1143af0d33094f0d580     
推测,猜测,猜想( conjecture的过去式和过去分词 )
参考例句:
  • The old peasant conjectured that it would be an unusually cold winter. 那老汉推测冬天将会异常地寒冷。
  • The general conjectured that the enemy only had about five days' supply of food left. 将军推测敌人只剩下五天的粮食给养。
42 tilting f68c899ac9ba435686dcb0f12e2bbb17     
倾斜,倾卸
参考例句:
  • For some reason he thinks everyone is out to get him, but he's really just tilting at windmills. 不知为什么他觉得每个人都想害他,但其实他不过是在庸人自扰。
  • So let us stop bickering within our ranks.Stop tilting at windmills. 所以,让我们结束内部间的争吵吧!再也不要去做同风车作战的蠢事了。
43 lesser UpxzJL     
adj.次要的,较小的;adv.较小地,较少地
参考例句:
  • Kept some of the lesser players out.不让那些次要的球员参加联赛。
  • She has also been affected,but to a lesser degree.她也受到波及,但程度较轻。
44 aeronautical 0fce381ad0fdd2394d73bfae598f4a00     
adj.航空(学)的
参考例句:
  • Many of the pilots were to achieve eminence in the aeronautical world. 这些飞行员中很多人将会在航空界声名显赫。 来自辞典例句
  • The advent of aircraft brought with it aeronautical engineering. 宇宙飞船的问世导致了航天工程的出现。 来自辞典例句
45 purely 8Sqxf     
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。
46 versatile 4Lbzl     
adj.通用的,万用的;多才多艺的,多方面的
参考例句:
  • A versatile person is often good at a number of different things.多才多艺的人通常擅长许多种不同的事情。
  • He had been one of the game's most versatile athletes.他是这项运动中技术最全面的运动员之一。
47 posthumous w1Ezl     
adj.遗腹的;父亡后出生的;死后的,身后的
参考例句:
  • He received a posthumous award for bravery.他表现勇敢,死后受到了嘉奖。
  • The legendary actor received a posthumous achievement award.这位传奇男星在过世后获得终身成就奖的肯定。
48 astronomical keTyO     
adj.天文学的,(数字)极大的
参考例句:
  • He was an expert on ancient Chinese astronomical literature.他是研究中国古代天文学文献的专家。
  • Houses in the village are selling for astronomical prices.乡村的房价正在飙升。
49 instinctive c6jxT     
adj.(出于)本能的;直觉的;(出于)天性的
参考例句:
  • He tried to conceal his instinctive revulsion at the idea.他试图饰盖自己对这一想法本能的厌恶。
  • Animals have an instinctive fear of fire.动物本能地怕火。
50 mechanism zCWxr     
n.机械装置;机构,结构
参考例句:
  • The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
  • The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。
51 demonstration 9waxo     
n.表明,示范,论证,示威
参考例句:
  • His new book is a demonstration of his patriotism.他写的新书是他的爱国精神的证明。
  • He gave a demonstration of the new technique then and there.他当场表演了这种新的操作方法。
52 concur CnXyH     
v.同意,意见一致,互助,同时发生
参考例句:
  • Wealth and happiness do not always concur.财富与幸福并非总是并存的。
  • I concur with the speaker in condemning what has been done.我同意发言者对所做的事加以谴责。
53 illustrated 2a891807ad5907f0499171bb879a36aa     
adj. 有插图的,列举的 动词illustrate的过去式和过去分词
参考例句:
  • His lecture was illustrated with slides taken during the expedition. 他在讲演中使用了探险时拍摄到的幻灯片。
  • The manufacturing Methods: Will be illustrated in the next chapter. 制作方法将在下一章说明。
54 forth Hzdz2     
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。
55 repose KVGxQ     
v.(使)休息;n.安息
参考例句:
  • Don't disturb her repose.不要打扰她休息。
  • Her mouth seemed always to be smiling,even in repose.她的嘴角似乎总是挂着微笑,即使在睡眠时也是这样。
56 joints d97dcffd67eca7255ca514e4084b746e     
接头( joint的名词复数 ); 关节; 公共场所(尤指价格低廉的饮食和娱乐场所) (非正式); 一块烤肉 (英式英语)
参考例句:
  • Expansion joints of various kinds are fitted on gas mains. 各种各样的伸缩接头被安装在煤气的总管道上了。
  • Expansion joints of various kinds are fitted on steam pipes. 各种各样的伸缩接头被安装在蒸气管道上了。
57 lateral 83ey7     
adj.侧面的,旁边的
参考例句:
  • An airfoil that controls lateral motion.能够控制横向飞行的机翼。
  • Mr.Dawson walked into the court from a lateral door.道森先生从一个侧面的门走进法庭。
58 perpendicular GApy0     
adj.垂直的,直立的;n.垂直线,垂直的位置
参考例句:
  • The two lines of bones are set perpendicular to one another.这两排骨头相互垂直。
  • The wall is out of the perpendicular.这墙有些倾斜。
59 underlying 5fyz8c     
adj.在下面的,含蓄的,潜在的
参考例句:
  • The underlying theme of the novel is very serious.小说隐含的主题是十分严肃的。
  • This word has its underlying meaning.这个单词有它潜在的含义。
60 inertia sbGzg     
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。
61 elastic Tjbzq     
n.橡皮圈,松紧带;adj.有弹性的;灵活的
参考例句:
  • Rubber is an elastic material.橡胶是一种弹性材料。
  • These regulations are elastic.这些规定是有弹性的。
62 elasticity 8jlzp     
n.弹性,伸缩力
参考例句:
  • The skin eventually loses its elasticity.皮肤最终会失去弹性。
  • Every sort of spring has a definite elasticity.每一种弹簧都有一定的弹性。
63 rebounds 87b0c2d1da6e752183ab26d425c5acd4     
反弹球( rebound的名词复数 ); 回弹球; 抢断篮板球; 复兴
参考例句:
  • V is the velocity after the gas particle rebounds from the wall. V是粒子从壁上弹开后的速度。
  • In the former case, the first body rebounds with practically its original velocity. 在前一种情况下,第一个物体实际上以原来的速度弹回。
64 accomplished UzwztZ     
adj.有才艺的;有造诣的;达到了的
参考例句:
  • Thanks to your help,we accomplished the task ahead of schedule.亏得你们帮忙,我们才提前完成了任务。
  • Removal of excess heat is accomplished by means of a radiator.通过散热器完成多余热量的排出。
65 revolve NBBzX     
vi.(使)旋转;循环出现
参考例句:
  • The planets revolve around the sun.行星绕着太阳运转。
  • The wheels began to revolve slowly.车轮开始慢慢转动。
66 upwards lj5wR     
adv.向上,在更高处...以上
参考例句:
  • The trend of prices is still upwards.物价的趋向是仍在上涨。
  • The smoke rose straight upwards.烟一直向上升。
67 laterally opIzAf     
ad.横向地;侧面地;旁边地
参考例句:
  • Shafts were sunk, with tunnels dug laterally. 竖井已经打下,并且挖有横向矿道。
  • When the plate becomes unstable, it buckles laterally. 当板失去稳定时,就发生横向屈曲。
68 drawn MuXzIi     
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。
69 flattened 1d5d9fedd9ab44a19d9f30a0b81f79a8     
[医](水)平扁的,弄平的
参考例句:
  • She flattened her nose and lips against the window. 她把鼻子和嘴唇紧贴着窗户。
  • I flattened myself against the wall to let them pass. 我身体紧靠着墙让他们通过。
70 virtue BpqyH     
n.德行,美德;贞操;优点;功效,效力
参考例句:
  • He was considered to be a paragon of virtue.他被认为是品德尽善尽美的典范。
  • You need to decorate your mind with virtue.你应该用德行美化心灵。
71 recoil GA4zL     
vi.退却,退缩,畏缩
参考例句:
  • Most people would recoil at the sight of the snake.许多人看见蛇都会向后退缩。
  • Revenge may recoil upon the person who takes it.报复者常会受到报应。
72 impetus L4uyj     
n.推动,促进,刺激;推动力
参考例句:
  • This is the primary impetus behind the economic recovery.这是促使经济复苏的主要动力。
  • Her speech gave an impetus to my ideas.她的讲话激发了我的思绪。
73 thoroughly sgmz0J     
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。
74 craftily d64e795384853d0165c9ff452a9d786b     
狡猾地,狡诈地
参考例句:
  • He craftily arranged to be there when the decision was announced. 在决议宣布之时,他狡猾地赶到了那里。
  • Strengthen basic training of calculation, get the kids to grasp the radical calculating ability craftily. 加强计算基本训练,通过分、小、百互化口算的练习,使学生熟练地掌握基本的计算技能。
75 remains 1kMzTy     
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。
76 doomed EuuzC1     
命定的
参考例句:
  • The court doomed the accused to a long term of imprisonment. 法庭判处被告长期监禁。
  • A country ruled by an iron hand is doomed to suffer. 被铁腕人物统治的国家定会遭受不幸的。
77 expended 39b2ea06557590ef53e0148a487bc107     
v.花费( expend的过去式和过去分词 );使用(钱等)做某事;用光;耗尽
参考例句:
  • She expended all her efforts on the care of home and children. 她把所有精力都花在料理家务和照顾孩子上。
  • The enemy had expended all their ammunition. 敌人已耗尽所有的弹药。 来自《简明英汉词典》
78 alleged gzaz3i     
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
79 motive GFzxz     
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。
80 deducted 0dc984071646e559dd56c3bd5451fd72     
v.扣除,减去( deduct的过去式和过去分词 )
参考例句:
  • The cost of your uniform will be deducted from your wages. 制服费将从你的工资中扣除。
  • The cost of the breakages will be deducted from your pay. 损坏东西的费用将从你的工资中扣除。 来自《简明英汉词典》
81 entirely 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。
82 mythical 4FrxJ     
adj.神话的;虚构的;想像的
参考例句:
  • Undeniably,he is a man of mythical status.不可否认,他是一个神话般的人物。
  • Their wealth is merely mythical.他们的财富完全是虚构的。
83 momentum DjZy8     
n.动力,冲力,势头;动量
参考例句:
  • We exploit the energy and momentum conservation laws in this way.我们就是这样利用能量和动量守恒定律的。
  • The law of momentum conservation could supplant Newton's third law.动量守恒定律可以取代牛顿第三定律。
84 velocity rLYzx     
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。
85 contraction sn6yO     
n.缩略词,缩写式,害病
参考例句:
  • The contraction of this muscle raises the lower arm.肌肉的收缩使前臂抬起。
  • The forces of expansion are balanced by forces of contraction.扩张力和收缩力相互平衡。
86 sufficiently 0htzMB     
adv.足够地,充分地
参考例句:
  • It turned out he had not insured the house sufficiently.原来他没有给房屋投足保险。
  • The new policy was sufficiently elastic to accommodate both views.新政策充分灵活地适用两种观点。
87 quotations c7bd2cdafc6bfb4ee820fb524009ec5b     
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》
88 investigators e970f9140785518a87fc81641b7c89f7     
n.调查者,审查者( investigator的名词复数 )
参考例句:
  • This memo could be the smoking gun that investigators have been looking for. 这份备忘录可能是调查人员一直在寻找的证据。
  • The team consisted of six investigators and two secretaries. 这个团队由六个调查人员和两个秘书组成。 来自《简明英汉词典》
89 combustion 4qKzS     
n.燃烧;氧化;骚动
参考例句:
  • We might be tempted to think of combustion.我们也许会联想到氧化。
  • The smoke formed by their combustion is negligible.由它燃烧所生成的烟是可忽略的。
90 wireless Rfwww     
adj.无线的;n.无线电
参考例句:
  • There are a lot of wireless links in a radio.收音机里有许多无线电线路。
  • Wireless messages tell us that the ship was sinking.无线电报告知我们那艘船正在下沉。
91 excerpt hzVyv     
n.摘录,选录,节录
参考例句:
  • This is an excerpt from a novel.这是一部小说的摘录。
  • Can you excerpt something from the newspaper? 你能从报纸上选录些东西吗?
92 vessel 4L1zi     
n.船舶;容器,器皿;管,导管,血管
参考例句:
  • The vessel is fully loaded with cargo for Shanghai.这艘船满载货物驶往上海。
  • You should put the water into a vessel.你应该把水装入容器中。
93 antedated d74ad7c386051efc887e8fe84213c2e1     
v.(在历史上)比…为早( antedate的过去式和过去分词 );先于;早于;(在信、支票等上)填写比实际日期早的日期
参考例句:
  • That event antedated World War Ⅱ. 那事件发生在第二次世界大战之前。 来自《简明英汉词典》
  • The hot weather antedated my departure for Beidaihe. 炎热的天气使我提前动身前往北戴河。 来自互联网
94 precluded 84f6ba3bf290d49387f7cf6189bc2f80     
v.阻止( preclude的过去式和过去分词 );排除;妨碍;使…行不通
参考例句:
  • Abdication is precluded by the lack of a possible successor. 因为没有可能的继承人,让位无法实现。 来自《简明英汉词典》
  • The bad weather precluded me from attending the meeting. 恶劣的天气使我不能出席会议。 来自《现代英汉综合大词典》
95 novice 1H4x1     
adj.新手的,生手的
参考例句:
  • As a novice writer,this is something I'm interested in.作为初涉写作的人,我对此很感兴趣。
  • She realized that she was a novice.她知道自己初出茅庐。
96 pious KSCzd     
adj.虔诚的;道貌岸然的
参考例句:
  • Alexander is a pious follower of the faith.亚历山大是个虔诚的信徒。
  • Her mother was a pious Christian.她母亲是一个虔诚的基督教徒。
97 vows c151b5e18ba22514580d36a5dcb013e5     
誓言( vow的名词复数 ); 郑重宣布,许愿
参考例句:
  • Matrimonial vows are to show the faithfulness of the new couple. 婚誓体现了新婚夫妇对婚姻的忠诚。
  • The nun took strait vows. 那位修女立下严格的誓愿。
98 dubious Akqz1     
adj.怀疑的,无把握的;有问题的,靠不住的
参考例句:
  • What he said yesterday was dubious.他昨天说的话很含糊。
  • He uses some dubious shifts to get money.他用一些可疑的手段去赚钱。
99 celebrated iwLzpz     
adj.有名的,声誉卓著的
参考例句:
  • He was soon one of the most celebrated young painters in England.不久他就成了英格兰最负盛名的年轻画家之一。
  • The celebrated violinist was mobbed by the audience.观众团团围住了这位著名的小提琴演奏家。
100 fable CzRyn     
n.寓言;童话;神话
参考例句:
  • The fable is given on the next page. 这篇寓言登在下一页上。
  • He had some motive in telling this fable. 他讲这寓言故事是有用意的。
101 proceeding Vktzvu     
n.行动,进行,(pl.)会议录,学报
参考例句:
  • This train is now proceeding from Paris to London.这次列车从巴黎开往伦敦。
  • The work is proceeding briskly.工作很有生气地进展着。
102 ascend avnzD     
vi.渐渐上升,升高;vt.攀登,登上
参考例句:
  • We watched the airplane ascend higher and higher.我们看着飞机逐渐升高。
  • We ascend in the order of time and of development.我们按时间和发展顺序向上溯。
103 exhausted 7taz4r     
adj.极其疲惫的,精疲力尽的
参考例句:
  • It was a long haul home and we arrived exhausted.搬运回家的这段路程特别长,到家时我们已筋疲力尽。
  • Jenny was exhausted by the hustle of city life.珍妮被城市生活的忙乱弄得筋疲力尽。
104 procured 493ee52a2e975a52c94933bb12ecc52b     
v.(努力)取得, (设法)获得( procure的过去式和过去分词 );拉皮条
参考例句:
  • These cars are to be procured through open tender. 这些汽车要用公开招标的办法购买。 来自《现代汉英综合大词典》
  • A friend procured a position in the bank for my big brother. 一位朋友为我哥哥谋得了一个银行的职位。 来自《用法词典》
105 plunged 06a599a54b33c9d941718dccc7739582     
v.颠簸( plunge的过去式和过去分词 );暴跌;骤降;突降
参考例句:
  • The train derailed and plunged into the river. 火车脱轨栽进了河里。
  • She lost her balance and plunged 100 feet to her death. 她没有站稳,从100英尺的高处跌下摔死了。
106 density rOdzZ     
n.密集,密度,浓度
参考例句:
  • The population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
  • The region has a very high population density.该地区的人口密度很高。
107 detailed xuNzms     
adj.详细的,详尽的,极注意细节的,完全的
参考例句:
  • He had made a detailed study of the terrain.他对地形作了缜密的研究。
  • A detailed list of our publications is available on request.我们的出版物有一份详细的目录备索。
108 lighter 5pPzPR     
n.打火机,点火器;驳船;v.用驳船运送;light的比较级
参考例句:
  • The portrait was touched up so as to make it lighter.这张画经过润色,色调明朗了一些。
  • The lighter works off the car battery.引燃器利用汽车蓄电池打火。
109 copper HZXyU     
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。
110 quaint 7tqy2     
adj.古雅的,离奇有趣的,奇怪的
参考例句:
  • There were many small lanes in the quaint village.在这古香古色的村庄里,有很多小巷。
  • They still keep some quaint old customs.他们仍然保留着一些稀奇古怪的旧风俗。
111 oars c589a112a1b341db7277ea65b5ec7bf7     
n.桨,橹( oar的名词复数 );划手v.划(行)( oar的第三人称单数 )
参考例句:
  • He pulled as hard as he could on the oars. 他拼命地划桨。
  • The sailors are bending to the oars. 水手们在拼命地划桨。 来自《简明英汉词典》
112 disturbances a0726bd74d4516cd6fbe05e362bc74af     
n.骚乱( disturbance的名词复数 );打扰;困扰;障碍
参考例句:
  • The government has set up a commission of inquiry into the disturbances at the prison. 政府成立了一个委员会来调查监狱骚乱事件。
  • Extra police were called in to quell the disturbances. 已调集了增援警力来平定骚乱。
113 vessels fc9307c2593b522954eadb3ee6c57480     
n.血管( vessel的名词复数 );船;容器;(具有特殊品质或接受特殊品质的)人
参考例句:
  • The river is navigable by vessels of up to 90 tons. 90 吨以下的船只可以从这条河通过。 来自《简明英汉词典》
  • All modern vessels of any size are fitted with radar installations. 所有现代化船只都有雷达装置。 来自《现代汉英综合大词典》
114 fortresses 0431acf60619033fe5f4e5a0520d82d7     
堡垒,要塞( fortress的名词复数 )
参考例句:
  • They will establish impregnable fortresses. 他们将建造坚不可摧的城堡。
  • Indra smashed through Vritra ninety-nine fortresses, and then came upon the dragon. 因陀罗摧毁了维他的九十九座城堡,然后与维他交手。 来自神话部分
115 brass DWbzI     
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。
116 varnished 14996fe4d70a450f91e6de0005fd6d4d     
浸渍过的,涂漆的
参考例句:
  • The doors are then stained and varnished. 这些门还要染色涂清漆。
  • He varnished the wooden table. 他给那张木桌涂了清漆。
117 incapable w9ZxK     
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。
118 ascertained e6de5c3a87917771a9555db9cf4de019     
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》
119 ignominiously 06ad56226c9512b3b1e466b6c6a73df2     
adv.耻辱地,屈辱地,丢脸地
参考例句:
  • Their attempt failed ignominiously. 他们的企图可耻地失败了。 来自《简明英汉词典》
  • She would be scolded, abused, ignominiously discharged. 他们会说她,骂她,解雇她,让她丢尽脸面的。 来自英汉文学 - 嘉莉妹妹
120 scrap JDFzf     
n.碎片;废料;v.废弃,报废
参考例句:
  • A man comes round regularly collecting scrap.有个男人定时来收废品。
  • Sell that car for scrap.把那辆汽车当残品卖了吧。
121 conspicuous spszE     
adj.明眼的,惹人注目的;炫耀的,摆阔气的
参考例句:
  • It is conspicuous that smoking is harmful to health.很明显,抽烟对健康有害。
  • Its colouring makes it highly conspicuous.它的色彩使它非常惹人注目。
122 module iEjxj     
n.组件,模块,模件;(航天器的)舱
参考例句:
  • The centre module displays traffic guidance information.中央模块显示交通引导信息。
  • Two large tanks in the service module held liquid oxygen.服务舱的两个大气瓶中装有液态氧。
123 applied Tz2zXA     
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。
124 contrive GpqzY     
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?
125 emulate tpqx9     
v.努力赶上或超越,与…竞争;效仿
参考例句:
  • You must work hard to emulate your sister.你必须努力工作,赶上你姐姐。
  • You must look at the film and try to emulate his behavior.你们必须观看这部电影,并尽力模仿他的动作。
126 aeronautics BKVyg     
n.航空术,航空学
参考例句:
  • National Aeronautics and Space undertakings have made great progress.国家的航空航天事业有了很大的发展。
  • He devoted every spare moment to aeronautics.他把他所有多余的时间用在航空学上。
127 worthy vftwB     
adj.(of)值得的,配得上的;有价值的
参考例句:
  • I did not esteem him to be worthy of trust.我认为他不值得信赖。
  • There occurred nothing that was worthy to be mentioned.没有值得一提的事发生。
128 promptly LRMxm     
adv.及时地,敏捷地
参考例句:
  • He paid the money back promptly.他立即还了钱。
  • She promptly seized the opportunity his absence gave her.她立即抓住了因他不在场给她创造的机会。
129 capabilities f7b11037f2050959293aafb493b7653c     
n.能力( capability的名词复数 );可能;容量;[复数]潜在能力
参考例句:
  • He was somewhat pompous and had a high opinion of his own capabilities. 他有点自大,自视甚高。 来自辞典例句
  • Some programmers use tabs to break complex product capabilities into smaller chunks. 一些程序员认为,标签可以将复杂的功能分为每个窗格一组简单的功能。 来自About Face 3交互设计精髓
130 cork VoPzp     
n.软木,软木塞
参考例句:
  • We heard the pop of a cork.我们听见瓶塞砰的一声打开。
  • Cork is a very buoyant material.软木是极易浮起的材料。
131 secondly cjazXx     
adv.第二,其次
参考例句:
  • Secondly,use your own head and present your point of view.第二,动脑筋提出自己的见解。
  • Secondly it is necessary to define the applied load.其次,需要确定所作用的载荷。
132 tilted 3gtzE5     
v. 倾斜的
参考例句:
  • Suddenly the boat tilted to one side. 小船突然倾向一侧。
  • She tilted her chin at him defiantly. 她向他翘起下巴表示挑衅。
133 obliquely ad073d5d92dfca025ebd4a198e291bdc     
adv.斜; 倾斜; 间接; 不光明正大
参考例句:
  • From the gateway two paths led obliquely across the court. 从门口那儿,有两条小路斜越过院子。 来自辞典例句
  • He was receding obliquely with a curious hurrying gait. 他歪着身子,古怪而急促地迈着步子,往后退去。 来自辞典例句
134 collapse aWvyE     
vi.累倒;昏倒;倒塌;塌陷
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。
  • The engineer made a complete diagnosis of the bridge's collapse.工程师对桥的倒塌做了一次彻底的调查分析。
135 perpendicularly 914de916890a9aa3714fa26fe542c2df     
adv. 垂直地, 笔直地, 纵向地
参考例句:
  • Fray's forehead was wrinkled both perpendicularly and crosswise. 弗雷的前额上纹路纵横。
  • Automatic resquaring feature insures nozzle is perpendicularly to the part being cut. 自动垂直功能,可以确保刀头回到与工件完全垂直的位置去切割。
136 hood ddwzJ     
n.头巾,兜帽,覆盖;v.罩上,以头巾覆盖
参考例句:
  • She is wearing a red cloak with a hood.她穿着一件红色带兜帽的披风。
  • The car hood was dented in.汽车的发动机罩已凹了进去。
137 suppliant nrdwr     
adj.哀恳的;n.恳求者,哀求者
参考例句:
  • He asked for help in a suppliant attitude.他以恳求的态度要我帮忙。
  • He knelt as a suppliant at the altar.他跪在祭坛前祈祷。
138 zeal mMqzR     
n.热心,热情,热忱
参考例句:
  • Revolutionary zeal caught them up,and they joined the army.革命热情激励他们,于是他们从军了。
  • They worked with great zeal to finish the project.他们热情高涨地工作,以期完成这个项目。
139 charlatan 8bWyv     
n.骗子;江湖医生;假内行
参考例句:
  • The charlatan boasted that he could charm off any disease.这个江湖骗子吹牛说他能用符咒治好各种疾病。
  • He was sure that he was dealing with a charlatan.他真以为自己遇上了江湖骗子。
140 bellows Ly5zLV     
n.风箱;发出吼叫声,咆哮(尤指因痛苦)( bellow的名词复数 );(愤怒地)说出(某事),大叫v.发出吼叫声,咆哮(尤指因痛苦)( bellow的第三人称单数 );(愤怒地)说出(某事),大叫
参考例句:
  • His job is to blow the bellows for the blacksmith. 他的工作是给铁匠拉风箱。 来自辞典例句
  • You could, I suppose, compare me to a blacksmith's bellows. 我想,你可能把我比作铁匠的风箱。 来自辞典例句
141 missionary ID8xX     
adj.教会的,传教(士)的;n.传教士
参考例句:
  • She taught in a missionary school for a couple of years.她在一所教会学校教了两年书。
  • I hope every member understands the value of missionary work. 我希望教友都了解传教工作的价值。
142 artistically UNdyJ     
adv.艺术性地
参考例句:
  • The book is beautifully printed and artistically bound. 这本书印刷精美,装帧高雅。
  • The room is artistically decorated. 房间布置得很美观。
143 friction JQMzr     
n.摩擦,摩擦力
参考例句:
  • When Joan returned to work,the friction between them increased.琼回来工作后,他们之间的摩擦加剧了。
  • Friction acts on moving bodies and brings them to a stop.摩擦力作用于运动着的物体,并使其停止。
144 prodigious C1ZzO     
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。
145 straps 1412cf4c15adaea5261be8ae3e7edf8e     
n.带子( strap的名词复数 );挎带;肩带;背带v.用皮带捆扎( strap的第三人称单数 );用皮带抽打;包扎;给…打绷带
参考例句:
  • the shoulder straps of her dress 她连衣裙上的肩带
  • The straps can be adjusted to suit the wearer. 这些背带可进行调整以适合使用者。
146 inevitably x7axc     
adv.不可避免地;必然发生地
参考例句:
  • In the way you go on,you are inevitably coming apart.照你们这样下去,毫无疑问是会散伙的。
  • Technological changes will inevitably lead to unemployment.技术变革必然会导致失业。
147 inexplicable tbCzf     
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。
148 exertion F7Fyi     
n.尽力,努力
参考例句:
  • We were sweating profusely from the exertion of moving the furniture.我们搬动家具大费气力,累得大汗淋漓。
  • She was hot and breathless from the exertion of cycling uphill.由于用力骑车爬坡,她浑身发热。
149 vertically SfmzYG     
adv.垂直地
参考例句:
  • Line the pages for the graph both horizontally and vertically.在这几页上同时画上横线和竖线,以便制作图表。
  • The human brain is divided vertically down the middle into two hemispheres.人脑从中央垂直地分为两半球。
150 fixed JsKzzj     
adj.固定的,不变的,准备好的;(计算机)固定的
参考例句:
  • Have you two fixed on a date for the wedding yet?你们俩选定婚期了吗?
  • Once the aim is fixed,we should not change it arbitrarily.目标一旦确定,我们就不应该随意改变。
151 retard 8WWxE     
n.阻止,延迟;vt.妨碍,延迟,使减速
参考例句:
  • Lack of sunlight will retard the growth of most plants.缺乏阳光会妨碍大多数植物的生长。
  • Continuing violence will retard negotiations over the country's future.持续不断的暴力活动会阻碍关系到国家未来的谈判的进行。
152 doctrine Pkszt     
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。
153 plausible hBCyy     
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。
154 ascent TvFzD     
n.(声望或地位)提高;上升,升高;登高
参考例句:
  • His rapid ascent in the social scale was surprising.他的社会地位提高之迅速令人吃惊。
  • Burke pushed the button and the elevator began its slow ascent.伯克按动电钮,电梯开始缓慢上升。
155 expenditure XPbzM     
n.(时间、劳力、金钱等)支出;使用,消耗
参考例句:
  • The entry of all expenditure is necessary.有必要把一切开支入账。
  • The monthly expenditure of our family is four hundred dollars altogether.我们一家的开销每月共计四百元。
156 atmospheric 6eayR     
adj.大气的,空气的;大气层的;大气所引起的
参考例句:
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
157 structural itXw5     
adj.构造的,组织的,建筑(用)的
参考例句:
  • The storm caused no structural damage.风暴没有造成建筑结构方面的破坏。
  • The North American continent is made up of three great structural entities.北美大陆是由三个构造单元组成的。
158 molecule Y6Tzn     
n.分子,克分子
参考例句:
  • A molecule of water is made up of two atoms of hygrogen and one atom of oxygen.一个水分子是由P妈̬f婘̬ 妈̬成的。
  • This gives us the structural formula of the molecule.这种方式给出了分子的结构式。
159 supremacy 3Hzzd     
n.至上;至高权力
参考例句:
  • No one could challenge her supremacy in gymnastics.她是最优秀的体操运动员,无人能胜过她。
  • Theoretically,she holds supremacy as the head of the state.从理论上说,她作为国家的最高元首拥有至高无上的权力。
160 painstaking 6A6yz     
adj.苦干的;艰苦的,费力的,刻苦的
参考例句:
  • She is not very clever but she is painstaking.她并不很聪明,但肯下苦功夫。
  • Through years of our painstaking efforts,we have at last achieved what we have today.大家经过多少年的努力,才取得今天的成绩。
161 impending 3qHzdb     
a.imminent, about to come or happen
参考例句:
  • Against a background of impending famine, heavy fighting took place. 即将发生饥荒之时,严重的战乱爆发了。
  • The king convoke parliament to cope with the impending danger. 国王召开国会以应付迫近眉睫的危险。
162 postponed 9dc016075e0da542aaa70e9f01bf4ab1     
vt.& vi.延期,缓办,(使)延迟vt.把…放在次要地位;[语]把…放在后面(或句尾)vi.(疟疾等)延缓发作(或复发)
参考例句:
  • The trial was postponed indefinitely. 审讯无限期延迟。
  • The game has already been postponed three times. 这场比赛已经三度延期了。
163 futility IznyJ     
n.无用
参考例句:
  • She could see the utter futility of trying to protest. 她明白抗议是完全无用的。
  • The sheer futility of it all exasperates her. 它毫无用处,这让她很生气。
164 astronomer DOEyh     
n.天文学家
参考例句:
  • A new star attracted the notice of the astronomer.新发现的一颗星引起了那位天文学家的注意。
  • He is reputed to have been a good astronomer.他以一个优秀的天文学者闻名于世。
165 monarchy e6Azi     
n.君主,最高统治者;君主政体,君主国
参考例句:
  • The monarchy in England plays an important role in British culture.英格兰的君主政体在英国文化中起重要作用。
  • The power of the monarchy in Britain today is more symbolical than real.今日英国君主的权力多为象徵性的,无甚实际意义。


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