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VII LILIENTHAL AND PILCHER
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There was never a more enthusiastic and consistent student of the problems of flight than Otto Lilienthal, who was born in 1848 at Anklam, Pomerania, and even from his early school-days dreamed and planned the conquest of the air. His practical experiments began when, at the age of thirteen, he and his brother Gustav made wings consisting of wooden framework covered with linen1, which Otto attached to his arms, and then ran downhill flapping them. In consequence of possible derision on the part of other boys, Otto confined these experiments for the most part to moonlit nights, and gained from them some idea of the resistance offered by flat surfaces to the air. It was in 1867 that the two brothers began really practical work, experimenting with wings which, from their design, indicate some knowledge of Besnier and the history of his gliding2 experiments; these wings the brothers fastened to their backs, moving them with their legs after the fashion of one attempting to swim. Before they had achieved any real success in gliding the Franco-German war came as an interruption; both brothers served in this campaign, resuming their experiments in 1871 at the conclusion of hostilities4.

The experiments made by the brothers previous to the war had convinced Otto that previous experimenters96 in gliding flight had failed through reliance on empirical conclusions or else through incomplete observation on their own part, mostly of bird flight. From 1871 onward5 Otto Lilienthal (Gustav’s interest in the problem was not maintained as was his brother’s) made what is probably the most detailed6 and accurate series of observations that has ever been made with regard to the properties of curved wing surfaces. So far as could be done, Lilienthal tabulated7 the amount of air resistance offered to a bird’s wing, ascertaining8 that the curve is necessary to flight, as offering far more resistance than a flat surface. Cayley, and others, had already stated this, but to Lilienthal belongs the honour of being first to put the statement to effective proof—he made over 2,000 gliding flights between 1891 and the regrettable end of his experiments; his practical conclusions are still regarded as part of the accepted theory of students of flight. In 1889 he published a work on the subject of gliding flight which stands as data for investigators9, and, on the conclusions embodied10 in this work, he began to build his gliders12 and practise what he had preached, turning from experiment with models to wings that he could use.

It was in the summer of 1891 that he built his first glider13 of rods of peeled willow14, over which was stretched strong cotton fabric15; with this, which had a supporting surface of about 100 square feet, Otto Lilienthal launched himself in the air from a spring board, making glides16 which, at first of only a few feet, gradually lengthened17. As his experience of the supporting qualities of the air progressed he gradually altered his designs until, when Pilcher visited him in the spring of 1895, he experimented with a glider, roughly made of97 peeled willow rods and cotton fabric, having an area of 150 square feet and weighing half a hundredweight. By this time Lilienthal had moved from his springboard to a conical artificial hill which he had had thrown up on level ground at Grosse Lichterfelde, near Berlin. This hill was made with earth taken from the excavations19 incurred20 in constructing a canal, and had a cave inside in which Lilienthal stored his machines. Pilcher, in his paper on ‘Gliding,’1 gives an excellent short summary of Lilienthal’s experiments, from which the following extracts are taken:—

‘At first Lilienthal used to experiment by jumping off a springboard with a good run. Then he took to practising on some hills close to Berlin. In the summer of 1892 he built a flat-roofed hut on the summit of a hill, from the top of which he used to jump, trying, of course, to soar as far as possible before landing.... One of the great dangers with a soaring machine is losing forward speed, inclining the machine too much down in front, and coming down head first. Lilienthal was the first to introduce the system of handling a machine in the air merely by moving his weight about in the machine; he always rested only on his elbows or on his elbows and shoulders....

‘In 1892 a canal was being cut, close to where Lilienthal lived, in the suburbs of Berlin, and with the surplus earth Lilienthal had a special hill thrown up to fly from. The country round is as flat as the sea, and there is not a house or tree near it to make the wind unsteady, so this was an ideal practising ground; for practising on natural hills is generally rendered very difficult by shifty and gusty21 winds.... This98 hill is 50 feet high, and conical. Inside the hill there is a cave for the machines to be kept in.... When Lilienthal made a good flight he used to land 300 feet from the centre of the hill, having come down at an angle of 1 in 6; but his best flights have been at an angle of about 1 in 10.

‘If it is calm, one must run a few steps down the hill, holding the machine as far back on oneself as possible, when the air will gradually support one, and one slides off the hill into the air. If there is any wind, one should face it at starting; to try to start with a side wind is most unpleasant. It is possible after a great deal of practice to turn in the air, and fairly quickly. This is accomplished22 by throwing one’s weight to one side, and thus lowering the machine on that side towards which one wants to turn. Birds do the same thing—crows and gulls23 show it very clearly. Last year Lilienthal chiefly experimented with double-surfaced machines. These were very much like the old machines with awnings24 spread above them.

‘The object of making these double-surfaced machines was to get more surface without increasing the length and width of the machine. This, of course, it does, but I personally object to any machine in which the wing surface is high above the weight. I consider that it makes the machine very difficult to handle in bad weather, as a puff25 of wind striking the surface, high above one, has a great tendency to heel the machine over.

‘Herr Lilienthal kindly26 allowed me to sail down his hill in one of these double-surfaced machines last June. With the great facility afforded by his conical hill the machine was handy enough; but I am afraid99 I should not be able to manage one at all in the squally districts I have had to practise in over here.

‘Herr Lilienthal came to grief through deserting his old method of balancing. In order to control his tipping movements more rapidly he attached a line from his horizontal rudder to his head, so that when he moved his head forward it would lift the rudder and tip the machine up in front, and vice27 versa. He was practising this on some natural hills outside Berlin, and he apparently28 got muddled29 with the two motions, and, in trying to regain30 speed after he had, through a lull31 in the wind, come to rest in the air, let the machine get too far down in front, came down head first and was killed.’

Then in another passage Pilcher enunciates32 what is the true value of such experiments as Lilienthal—and, subsequently, he himself—made: ‘The object of experimenting with soaring machines,’ he says, ‘is to enable one to have practice in starting and alighting and controlling a machine in the air. They cannot possibly float horizontally in the air for any length of time, but to keep going must necessarily lose in elevation33. They are excellent schooling34 machines, and that is all they are meant to be, until power, in the shape of an engine working a screw propeller35, or an engine working wings to drive the machine forward, is added; then a person who is used to soaring down a hill with a simple soaring machine will be able to fly with comparative safety. One can best compare them to bicycles having no cranks, but on which one could learn to balance by coming down an incline.’

It was in 1895 that Lilienthal passed from experiment with the monoplane type of glider to the construction100 of a biplane glider which, according to his own account, gave better results than his previous machines. ‘Six or seven metres velocity36 of wind,’ he says, ‘sufficed to enable the sailing surface of 18 square metres to carry me almost horizontally against the wind from the top of my hill without any starting jump. If the wind is stronger I allow myself to be simply lifted from the point of the hill and to sail slowly towards the wind. The direction of the flight has, with strong wind, a strong upwards37 tendency. I often reach positions in the air which are much higher than my starting point. At the climax38 of such a line of flight I sometimes come to a standstill for some time, so that I am enabled while floating to speak with the gentlemen who wish to photograph me, regarding the best position for the photographing.’

Lilienthal’s work did not end with simple gliding, though he did not live to achieve machine-driven flight. Having, as he considered, gained sufficient experience with gliders, he constructed a power-driven machine which weighed altogether about 90 lbs., and this was thoroughly39 tested. The extremities40 of its wings were made to flap, and the driving power was obtained from a cylinder41 of compressed carbonic acid gas, released through a hand-operated valve which, Lilienthal anticipated, would keep the machine in the air for four minutes. There were certain minor42 accidents to the mechanism43, which delayed the trial flights, and on the day that Lilienthal had determined44 to make his trial he made a long gliding flight with a view to testing a new form of rudder that—as Pilcher relates—was worked by movements of his head. His death came about through the causes that Pilcher states; he fell101 from a height of 50 feet, breaking his spine45, and the next day he died.

It may be said that Lilienthal accomplished as much as any one of the great pioneers of flying. As brilliant in his conceptions as da Vinci had been in his, and as conscientious46 a worker as Borelli, he laid the foundations on which Pilcher, Chanute, and Professor Montgomery were able to build to such good purpose. His book on bird flight, published in 1889, with the authorship credited both to Otto and his brother Gustav, is regarded as epoch-making; his gliding experiments are no less entitled to this description.

In England Lilienthal’s work was carried on by Percy Sinclair Pilcher, who, born in 1866, completed six years’ service in the British Navy by the time that he was nineteen, and then went through a course of engineering, subsequently joining Maxim47 in his experimental work. It was not until 1895 that he began to build the first of the series of gliders with which he earned his plane among the pioneers of flight. Probably the best account of Pilcher’s work is that given in the Aeronautical48 Classics issued by the Royal Aeronautical Society, from which the following account of Pilcher’s work is mainly abstracted.2

The ‘Bat,’ as Pilcher named his first glider, was a monoplane which he completed before he paid his visit to Lilienthal in 1895. Concerning this Pilcher stated that he purposely finished his own machine before going to see Lilienthal, so as to get the greatest advantage from any original ideas he might have; he was not able to make any trials with this machine, however, until after witnessing Lilienthal’s experiments102 and making several glides in the biplane glider which Lilienthal constructed.

The wings of the ‘Bat’ formed a pronounced dihedral angle; the tips being raised 4 feet above the body. The spars forming the entering edges of the wings crossed each other in the centre and were lashed49 to opposite sides of the triangle that served as a mast for the stay-wires that guyed the wings. The four ribs50 of each wing, enclosed in pockets in the fabric, radiated fanwise from the centre, and were each stayed by three steel piano-wires to the top of the triangular52 mast, and similarly to its base. These ribs were bolted down to the triangle at their roots, and could be easily folded back on to the body when the glider was not in use. A small fixed53 vertical54 surface was carried in the rear. The framework and ribs were made entirely55 of Riga pine; the surface fabric was nainsook. The area of the machine was 150 square feet; its weight 45 lbs.; so that in flight, with Pilcher’s weight of 145 lbs. added, it carried one and a half pounds to the square foot.
Rear view of Pilcher’s ‘Beetle.’
The ‘Beetle.’ side view.
Pilcher starting on glide11 with the ‘Bat.’

Pilcher’s first glides, which he carried out on a grass hill on the banks of the Clyde near Cardross, gave little result, owing to the exaggerated dihedral angle of the wings, and the absence of a horizontal tail. The ‘Bat’ was consequently reconstructed with a horizontal tail-plane added to the vertical one, and with the wings lowered so that the tips were only six inches above the level of the body. The machine now gave far better results; on the first glide into a head wind Pilcher rose to a height of twelve feet and remained in the air for a third of a minute; in the second attempt a rope was used to tow the glider, which rose to twenty feet and did not come to earth again until103 nearly a minute had passed. With experience Pilcher was able to lengthen18 his glide and improve his balance, but the dropped wing tips made landing difficult, and there were many breakages.

In consequence of this Pilcher built a second glider which he named the ‘Beetle,’ because, as he said, it looked like one. In this the square-cut wings formed almost a continuous plane, rigidly56 fixed to the central body, which consisted of a shaped girder. These wings were built up of five transverse bamboo spars, with two shaped ribs running from fore3 to aft of each wing, and were stayed overhead to a couple of masts. The tail, consisting of two discs placed crosswise (the horizontal one alone being movable), was carried high up in the rear. With the exception of the wing-spars, the whole framework was built of white pine. The wings in this machine were actually on a higher level than the operator’s head; the centre of gravity was, consequently, very low, a fact which, according to Pilcher’s own account, made the glider very difficult to handle. Moreover, the weight of the ‘Beetle,’ 80 lbs., was considerable; the body had been very solidly built to enable it to carry the engine which Pilcher was then contemplating57; so that the glider carried some 225 lbs. with its area of 170 square feet-too great a mass for a single man to handle with comfort.

It was in the spring of 1896 that Pilcher built his third glider, the ‘Gull,’ with 300 square feet of area and a weight of 55 lbs. The size of this machine rendered it unsuitable for experiment in any but very calm weather, and it incurred such damage when experiments were made in a breeze that Pilcher found it necessary to build a fourth, which he named the104 ‘Hawk.’ This machine was very soundly built, being constructed of bamboo, with the exception of the two main transverse beams. The wings were attached to two vertical masts, 7 feet high, and 8 feet apart, joined at their summits and their centres by two wooden beams. Each wing had nine bamboo ribs, radiating from its mast, which was situated58 at a distance of 2 feet 6 inches from the forward edge of the wing. Each rib51 was rigidly stayed at the top of the mast by three tie-wires, and by a similar number to the bottom of the mast, by which means the curve of each wing was maintained uniformly. The tail was formed of a triangular horizontal surface to which was affixed59 a triangular vertical surface, and was carried from the body on a high bamboo mast, which was also stayed from the masts by means of steel wires, but only on its upper surface, and it was the snapping of one of these guy wires which caused the collapse60 of the tail support and brought about the fatal end of Pilcher s experiments. In flight, Pilcher’s head, shoulders, and the greater part of his chest projected above the wings. He took up his position by passing his head and shoulders through the top aperture61 formed between the two wings, and resting his forearms on the longitudinal body members. A very simple form of undercarriage, which took the weight off the glider on the ground, was fitted, consisting of two bamboo rods with wheels suspended on steel springs.

Balance and steering62 were effected, apart from the high degree of inherent stability afforded by the tail, as in the case of Lilienthal’s glider, by altering the position of the body. With this machine Pilcher made some twelve glides at Eynsford in Kent in the summer105 of 1896, and as he progressed he increased the length of his glides, and also handled the machine more easily, both in the air and in landing. He was occupied with plans for fitting an engine and propeller to the ‘Hawk,’ but, in these early days of the internal combustion63 engine, was unable to get one light enough for his purpose. There were rumours64 of an engine weighing 15 lbs. which gave 1 horse-power, and was reported to be in existence in America, but it could not be traced.

In the spring of 1897 Pilcher took up his gliding experiments again, obtaining what was probably the best of his glides on June 19th, when he alighted after a perfectly65 balanced glide of over 250 yards in length, having crossed a valley at a considerable height. From his various experiments he concluded that once the machine was launched in the air an engine of, at most, 3 horse-power would suffice for the maintenance of horizontal flight, but he had to allow for the additional weight of the engine and propeller, and taking into account the comparative inefficiency66 of the propeller, he planned for an engine of 4 horse-power. Engine and propeller together were estimated at under 44 lbs. weight, the engine was to be fitted in front of the operator, and by means of an overhead shaft67 was to operate the propeller situated in rear of the wings. 1898 went by while this engine was under construction. Then in 1899 Pilcher became interested in Lawrence Hargrave’s soaring kites, with which he carried out experiments during the summer of 1899. It is believed that he intended to incorporate a number of these kites in a new machine, a triplane, of which the fragments remaining are hardly sufficient to reconstitute the complete glider. This new machine was never given a trial, for on September 30th, 1899,106 at Stamford Hall, Market Harborough, Pilcher agreed to give a demonstration68 of gliding flight, but owing to the unfavourable weather he decided69 to postpone70 the trial of the new machine and to experiment with the ‘Hawk,’ which was intended to rise from a level field, towed by a line passing over a tackle drawn71 by two horses. At the first trial the machine rose easily, but the tow-line snapped when it was well clear of the ground, and the glider descended72, weighed down through being sodden73 with rain. Pilcher resolved on a second trial, in which the glider again rose easily to about thirty feet, when one of the guy wires of the tail broke, and the tail collapsed74; the machine fell to the ground, turning over, and Pilcher was unconscious when he was freed from the wreckage75.

Hopes were entertained of his recovery, but he died on Monday, October 2nd, 1899, aged76 only thirty-four. His work in the cause of flying lasted only four years, but in that time his actual accomplishments77 were sufficient to place his name beside that of Lilienthal, with whom he ranks as one of the greatest exponents78 of gliding flight.
‘The Hawk’—front view.
‘The Hawk’—rear view.
‘The Hawk’—in flight with Pilcher.

点击收听单词发音收听单词发音  

1 linen W3LyK     
n.亚麻布,亚麻线,亚麻制品;adj.亚麻布制的,亚麻的
参考例句:
  • The worker is starching the linen.这名工人正在给亚麻布上浆。
  • Fine linen and cotton fabrics were known as well as wool.精细的亚麻织品和棉织品像羊毛一样闻名遐迩。
2 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。
3 fore ri8xw     
adv.在前面;adj.先前的;在前部的;n.前部
参考例句:
  • Your seat is in the fore part of the aircraft.你的座位在飞机的前部。
  • I have the gift of fore knowledge.我能够未卜先知。
4 hostilities 4c7c8120f84e477b36887af736e0eb31     
n.战争;敌意(hostility的复数);敌对状态;战事
参考例句:
  • Mexico called for an immediate cessation of hostilities. 墨西哥要求立即停止敌对行动。
  • All the old hostilities resurfaced when they met again. 他们再次碰面时,过去的种种敌意又都冒了出来。
5 onward 2ImxI     
adj.向前的,前进的;adv.向前,前进,在先
参考例句:
  • The Yellow River surges onward like ten thousand horses galloping.黄河以万马奔腾之势滚滚向前。
  • He followed in the steps of forerunners and marched onward.他跟随着先辈的足迹前进。
6 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。
7 tabulated cb52faa26d48a2b1eb53a125f5fad3c3     
把(数字、事实)列成表( tabulate的过去式和过去分词 )
参考例句:
  • Results for the test program haven't been tabulated. 试验的结果还没有制成表格。
  • A large number of substances were investigated and the relevant properties tabulated. 已经研究了多种物质,并将有关性质列成了表。
8 ascertaining e416513cdf74aa5e4277c1fc28aab393     
v.弄清,确定,查明( ascertain的现在分词 )
参考例句:
  • I was ascertaining whether the cellar stretched out in front or behind. 我当时是要弄清楚地下室是朝前还是朝后延伸的。 来自辞典例句
  • The design and ascertaining of permanent-magnet-biased magnetic bearing parameter are detailed introduced. 并对永磁偏置磁悬浮轴承参数的设计和确定进行了详细介绍。 来自互联网
9 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》
10 embodied 12aaccf12ed540b26a8c02d23d463865     
v.表现( embody的过去式和过去分词 );象征;包括;包含
参考例句:
  • a politician who embodied the hopes of black youth 代表黑人青年希望的政治家
  • The heroic deeds of him embodied the glorious tradition of the troops. 他的英雄事迹体现了军队的光荣传统。 来自《简明英汉词典》
11 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。
12 gliders a7deb46dbc14e35d759f16adee20c410     
n.滑翔机( glider的名词复数 )
参考例句:
  • The albatross is the king of gliders. 信天翁是滑翔鸟类之王。 来自《用法词典》
  • For three summers, may bested and improved their gliders. 他们花了三个夏天不断地测试、改进。 来自英汉非文学 - 科学史
13 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。
14 willow bMFz6     
n.柳树
参考例句:
  • The river was sparsely lined with willow trees.河边疏疏落落有几棵柳树。
  • The willow's shadow falls on the lake.垂柳的影子倒映在湖面上。
15 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。
16 glides 31de940e5df0febeda159e69e005a0c9     
n.滑行( glide的名词复数 );滑音;音渡;过渡音v.滑动( glide的第三人称单数 );掠过;(鸟或飞机 ) 滑翔
参考例句:
  • The new dance consists of a series of glides. 这种新舞蹈中有一连串的滑步。 来自《简明英汉词典》
  • The stately swan glides gracefully on the pond. 天鹅在池面上优美地游动。 来自《简明英汉词典》
17 lengthened 4c0dbc9eb35481502947898d5e9f0a54     
(时间或空间)延长,伸长( lengthen的过去式和过去分词 )
参考例句:
  • The afternoon shadows lengthened. 下午影子渐渐变长了。
  • He wanted to have his coat lengthened a bit. 他要把上衣放长一些。
18 lengthen n34y1     
vt.使伸长,延长
参考例句:
  • He asked the tailor to lengthen his coat.他请裁缝把他的外衣放长些。
  • The teacher told her to lengthen her paper out.老师让她把论文加长。
19 excavations 185c90d3198bc18760370b8a86c53f51     
n.挖掘( excavation的名词复数 );开凿;开凿的洞穴(或山路等);(发掘出来的)古迹
参考例句:
  • The excavations are open to the public. 发掘现场对公众开放。
  • This year's excavations may reveal ancient artifacts. 今年的挖掘可能会发现史前古器物。 来自辞典例句
20 incurred a782097e79bccb0f289640bab05f0f6c     
[医]招致的,遭受的; incur的过去式
参考例句:
  • She had incurred the wrath of her father by marrying without his consent 她未经父亲同意就结婚,使父亲震怒。
  • We will reimburse any expenses incurred. 我们将付还所有相关费用。
21 gusty B5uyu     
adj.起大风的
参考例句:
  • Weather forecasts predict more hot weather,gusty winds and lightning strikes.天气预报预测高温、大风和雷电天气将继续。
  • Why was Candlestick Park so windy and gusty? 埃德尔斯蒂克公园里为什么会有那么多的强劲阵风?
22 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。
23 gulls 6fb3fed3efaafee48092b1fa6f548167     
n.鸥( gull的名词复数 )v.欺骗某人( gull的第三人称单数 )
参考例句:
  • A flock of sea gulls are hovering over the deck. 一群海鸥在甲板上空飞翔。 来自《现代汉英综合大词典》
  • The gulls which haunted the outlying rocks in a prodigious number. 数不清的海鸥在遥远的岩石上栖息。 来自辞典例句
24 awnings awnings     
篷帐布
参考例句:
  • Striped awnings had been stretched across the courtyard. 一些条纹雨篷撑开架在院子上方。
  • The room, shadowed well with awnings, was dark and cool. 这间屋子外面有这篷挡着,又阴暗又凉快。
25 puff y0cz8     
n.一口(气);一阵(风);v.喷气,喘气
参考例句:
  • He took a puff at his cigarette.他吸了一口香烟。
  • They tried their best to puff the book they published.他们尽力吹捧他们出版的书。
26 kindly tpUzhQ     
adj.和蔼的,温和的,爽快的;adv.温和地,亲切地
参考例句:
  • Her neighbours spoke of her as kindly and hospitable.她的邻居都说她和蔼可亲、热情好客。
  • A shadow passed over the kindly face of the old woman.一道阴影掠过老太太慈祥的面孔。
27 vice NU0zQ     
n.坏事;恶习;[pl.]台钳,老虎钳;adj.副的
参考例句:
  • He guarded himself against vice.他避免染上坏习惯。
  • They are sunk in the depth of vice.他们堕入了罪恶的深渊。
28 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。
29 muddled cb3d0169d47a84e95c0dfa5c4d744221     
adj.混乱的;糊涂的;头脑昏昏然的v.弄乱,弄糟( muddle的过去式);使糊涂;对付,混日子
参考例句:
  • He gets muddled when the teacher starts shouting. 老师一喊叫他就心烦意乱。
  • I got muddled up and took the wrong turning. 我稀里糊涂地拐错了弯。 来自《简明英汉词典》
30 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。
31 lull E8hz7     
v.使安静,使入睡,缓和,哄骗;n.暂停,间歇
参考例句:
  • The drug put Simpson in a lull for thirty minutes.药物使辛普森安静了30分钟。
  • Ground fighting flared up again after a two-week lull.经过两个星期的平静之后,地面战又突然爆发了。
32 enunciates d465d46148f7eec9b25dc84075357674     
n.(清晰地)发音( enunciate的名词复数 );确切地说明v.(清晰地)发音( enunciate的第三人称单数 );确切地说明
参考例句:
  • She enunciates very slowly and carefully. 她缓慢、仔细而又清晰地读着。 来自辞典例句
  • The Charter for Youth enunciates principles and ideals in youth development. 《青年约章》阐述青年发展的原则和理想。 来自互联网
33 elevation bqsxH     
n.高度;海拔;高地;上升;提高
参考例句:
  • The house is at an elevation of 2,000 metres.那幢房子位于海拔两千米的高处。
  • His elevation to the position of General Manager was announced yesterday.昨天宣布他晋升总经理职位。
34 schooling AjAzM6     
n.教育;正规学校教育
参考例句:
  • A child's access to schooling varies greatly from area to area.孩子获得学校教育的机会因地区不同而大相径庭。
  • Backward children need a special kind of schooling.天赋差的孩子需要特殊的教育。
35 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。
36 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。
37 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。
38 climax yqyzc     
n.顶点;高潮;v.(使)达到顶点
参考例句:
  • The fifth scene was the climax of the play.第五场是全剧的高潮。
  • His quarrel with his father brought matters to a climax.他与他父亲的争吵使得事态发展到了顶点。
39 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。
40 extremities AtOzAr     
n.端点( extremity的名词复数 );尽头;手和足;极窘迫的境地
参考例句:
  • She was most noticeable, I thought, in respect of her extremities. 我觉得她那副穷极可怜的样子实在太惹人注目。 来自辞典例句
  • Winters may be quite cool at the northwestern extremities. 西北边区的冬天也可能会相当凉。 来自辞典例句
41 cylinder rngza     
n.圆筒,柱(面),汽缸
参考例句:
  • What's the volume of this cylinder?这个圆筒的体积有多少?
  • The cylinder is getting too much gas and not enough air.汽缸里汽油太多而空气不足。
42 minor e7fzR     
adj.较小(少)的,较次要的;n.辅修学科;vi.辅修
参考例句:
  • The young actor was given a minor part in the new play.年轻的男演员在这出新戏里被分派担任一个小角色。
  • I gave him a minor share of my wealth.我把小部分财产给了他。
43 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。
44 determined duszmP     
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。
45 spine lFQzT     
n.脊柱,脊椎;(动植物的)刺;书脊
参考例句:
  • He broke his spine in a fall from a horse.他从马上跌下摔断了脊梁骨。
  • His spine developed a slight curve.他的脊柱有点弯曲。
46 conscientious mYmzr     
adj.审慎正直的,认真的,本着良心的
参考例句:
  • He is a conscientious man and knows his job.他很认真负责,也很懂行。
  • He is very conscientious in the performance of his duties.他非常认真地履行职责。
47 maxim G2KyJ     
n.格言,箴言
参考例句:
  • Please lay the maxim to your heart.请把此格言记在心里。
  • "Waste not,want not" is her favourite maxim.“不浪费则不匮乏”是她喜爱的格言。
48 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
49 lashed 4385e23a53a7428fb973b929eed1bce6     
adj.具睫毛的v.鞭打( lash的过去式和过去分词 );煽动;紧系;怒斥
参考例句:
  • The rain lashed at the windows. 雨点猛烈地打在窗户上。
  • The cleverly designed speech lashed the audience into a frenzy. 这篇精心设计的演说煽动听众使他们发狂。 来自《简明英汉词典》
50 ribs 24fc137444401001077773555802b280     
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。
51 rib 6Xgxu     
n.肋骨,肋状物
参考例句:
  • He broke a rib when he fell off his horse.他从马上摔下来折断了一根肋骨。
  • He has broken a rib and the doctor has strapped it up.他断了一根肋骨,医生已包扎好了。
52 triangular 7m1wc     
adj.三角(形)的,三者间的
参考例句:
  • It's more or less triangular plot of land.这块地略成三角形。
  • One particular triangular relationship became the model of Simone's first novel.一段特殊的三角关系成了西蒙娜第一本小说的原型。
53 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。
54 vertical ZiywU     
adj.垂直的,顶点的,纵向的;n.垂直物,垂直的位置
参考例句:
  • The northern side of the mountain is almost vertical.这座山的北坡几乎是垂直的。
  • Vertical air motions are not measured by this system.垂直气流的运动不用这种系统来测量。
55 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。
56 rigidly hjezpo     
adv.刻板地,僵化地
参考例句:
  • Life today is rigidly compartmentalized into work and leisure. 当今的生活被严格划分为工作和休闲两部分。
  • The curriculum is rigidly prescribed from an early age. 自儿童时起即已开始有严格的课程设置。
57 contemplating bde65bd99b6b8a706c0f139c0720db21     
深思,细想,仔细考虑( contemplate的现在分词 ); 注视,凝视; 考虑接受(发生某事的可能性); 深思熟虑,沉思,苦思冥想
参考例句:
  • You're too young to be contemplating retirement. 你考虑退休还太年轻。
  • She stood contemplating the painting. 她站在那儿凝视那幅图画。
58 situated JiYzBH     
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。
59 affixed 0732dcfdc852b2620b9edaa452082857     
adj.[医]附着的,附着的v.附加( affix的过去式和过去分词 );粘贴;加以;盖(印章)
参考例句:
  • The label should be firmly affixed to the package. 这张标签应该牢牢地贴在包裹上。
  • He affixed the sign to the wall. 他将标记贴到墙上。 来自《简明英汉词典》
60 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。
61 aperture IwFzW     
n.孔,隙,窄的缺口
参考例句:
  • The only light came through a narrow aperture.仅有的光亮来自一个小孔。
  • We saw light through a small aperture in the wall.我们透过墙上的小孔看到了亮光。
62 steering 3hRzbi     
n.操舵装置
参考例句:
  • He beat his hands on the steering wheel in frustration. 他沮丧地用手打了几下方向盘。
  • Steering according to the wind, he also framed his words more amicably. 他真会看风使舵,口吻也马上变得温和了。
63 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。
64 rumours ba6e2decd2e28dec9a80f28cb99e131d     
n.传闻( rumour的名词复数 );风闻;谣言;谣传
参考例句:
  • The rumours were completely baseless. 那些谣传毫无根据。
  • Rumours of job losses were later confirmed. 裁员的传言后来得到了证实。
65 perfectly 8Mzxb     
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。
66 inefficiency N7Xxn     
n.无效率,无能;无效率事例
参考例句:
  • Conflict between management and workers makes for inefficiency in the workplace. 资方与工人之间的冲突使得工厂生产效率很低。 来自《简明英汉词典》
  • This type of inefficiency arises because workers and management are ill-equipped. 出现此种低效率是因为工人与管理层都能力不足。 来自《简明英汉词典》
67 shaft YEtzp     
n.(工具的)柄,杆状物
参考例句:
  • He was wounded by a shaft.他被箭击中受伤。
  • This is the shaft of a steam engine.这是一个蒸汽机主轴。
68 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。
69 decided lvqzZd     
adj.决定了的,坚决的;明显的,明确的
参考例句:
  • This gave them a decided advantage over their opponents.这使他们比对手具有明显的优势。
  • There is a decided difference between British and Chinese way of greeting.英国人和中国人打招呼的方式有很明显的区别。
70 postpone rP0xq     
v.延期,推迟
参考例句:
  • I shall postpone making a decision till I learn full particulars.在未获悉详情之前我得从缓作出决定。
  • She decided to postpone the converastion for that evening.她决定当天晚上把谈话搁一搁。
71 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。
72 descended guQzoy     
a.为...后裔的,出身于...的
参考例句:
  • A mood of melancholy descended on us. 一种悲伤的情绪袭上我们的心头。
  • The path descended the hill in a series of zigzags. 小路呈连续的之字形顺着山坡蜿蜒而下。
73 sodden FwPwm     
adj.浑身湿透的;v.使浸透;使呆头呆脑
参考例句:
  • We stripped off our sodden clothes.我们扒下了湿透的衣服。
  • The cardboard was sodden and fell apart in his hands.纸板潮得都发酥了,手一捏就碎。
74 collapsed cwWzSG     
adj.倒塌的
参考例句:
  • Jack collapsed in agony on the floor. 杰克十分痛苦地瘫倒在地板上。
  • The roof collapsed under the weight of snow. 房顶在雪的重压下突然坍塌下来。
75 wreckage nMhzF     
n.(失事飞机等的)残骸,破坏,毁坏
参考例句:
  • They hauled him clear of the wreckage.他们把他从形骸中拖出来。
  • New states were born out of the wreckage of old colonial empires.新生国家从老殖民帝国的废墟中诞生。
76 aged 6zWzdI     
adj.年老的,陈年的
参考例句:
  • He had put on weight and aged a little.他胖了,也老点了。
  • He is aged,but his memory is still good.他已年老,然而记忆力还好。
77 accomplishments 1c15077db46e4d6425b6f78720939d54     
n.造诣;完成( accomplishment的名词复数 );技能;成绩;成就
参考例句:
  • It was one of the President's greatest accomplishments. 那是总统最伟大的成就之一。
  • Among her accomplishments were sewing,cooking,playing the piano and dancing. 她的才能包括缝纫、烹调、弹钢琴和跳舞。 来自《现代英汉综合大词典》
78 exponents 2f711bc1acfc4fcc18827d8a2655a05f     
n.倡导者( exponent的名词复数 );说明者;指数;能手
参考例句:
  • Its tendency to archaic language was tempered by the indolence of its exponents. 它的应用古语的趋势却被用语者的懒散所冲淡。 来自辞典例句
  • The exponents of this trend are trying to lead us towards capitalism. 这股思潮的代表人物是要把我们引导到资本主义方向上去。 来自互联网


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