【正文】 100. As the time and cost of making a clip drop to a few days and a few hundred dollars，engineers may soon be free to let their imaginations soar without being penalized by expensive failure. 隨著芯片制造時間和費用降低到了幾天和幾百美元，工程師們可能很快可以任他們的想象馳騁而不會被昂貴的失敗所懲罰。 99. It has been found that certain bats emit squeaks and by receiving the echoes， they can locate and steer clear of obstacles——or locate flying insects on which they feed. This echolocation in bats is often pared with radar， the principle of which is similar. 人們已經(jīng)發(fā)現(xiàn)，某些蝙蝠發(fā)出尖叫聲并靠接受回響來鎖定和避免障礙物 ——或者找到它們賴以為生的昆蟲。 97. I am always amazed when I hear people saying that sport creates goodwill between the nations， and that if only the mon peoples of the world could meet one another at football or cricket， they would have no inclination to meet on the battlefield. 每次我聽說體育運動能夠在國家間建立起友好感情，說世界各地的普通人只要能在足球場或板球場上相遇就會沒有興趣在戰(zhàn)場上相遇的話，我都倍感詫異。它們帶有自由的氣息，他們不會為狹隘的野心和貪婪享受而孜孜以求。這也許就是困難之所在。不過他們并不是刻意去追求刺激的。 93. Insects would make it impossible for us to live in the world； they would devour all our crops and kill our flocks and herds， if it were not for the protection we get from insecteating animals. 昆蟲就將會使我們無法在這個世界上居??；如果我們沒有受到以昆蟲為食的動 物的保護，昆蟲就會吞嚼掉我們所有的莊稼并殺死我們飼養(yǎng)的禽獸。 91. Arid regions in the southwestern United States have bee increasingly inviting playgrounds for the growing number of recreation seekers who own vehicles such as motorcycles or powered trail bikes and indulge in hillclimbing contests or in caving new trails in the desert. 美國西部的不毛之地正成為玩耍的地方，對越來越多擁有摩托車或越野單車類車輛的，喜歡放縱于爬坡比賽或開辟新的沙漠通道的尋歡作樂者具有不斷增長的吸引力。 89. Because of the space crunch， the Art Museum has bee increasingly cautious in considering acquisitions and donations of art， in some cases passing up opportunities to strengthen is collections. 由于空間不足，藝術(shù)博物館在考慮購買和接受捐贈的藝術(shù)品是越來越慎重，有些情況下放棄其進(jìn)一步改 善收藏的機會。 87. Three years of research at an abandoned coal mine in Argonne， Illinois， have resulted in findings that scientists believe can help reclaim thousands of mine disposal sites that scar the coalrich regions of the United States. 在伊利諾州 Angonne 市的一個廢棄煤礦的三年研究取得了成果，科學(xué)家們相信這些成果可以幫助改造把美國產(chǎn)煤區(qū)弄得傷痕累累的數(shù)千個舊煤場。它能做的最敏捷的動作就是揮一揮它彎曲的胳膊。 85. The sloth pays such little attention to its personal hygiene that green algae grow on its coarse hair and munities of a parasitic moth live in the depths of its coat producing caterpillars which graze on its mouldy hair. Its muscles are such that it is quits incapable of moving at a speed of over a kilometer an hour even over the shortest distances and the swiftest movement it can make is a sweep of its hooked arm. 樹獺即不講究衛(wèi)生，以至于它粗糙的毛發(fā)上生出綠苔，成群的寄生蛾生長在它的皮毛深處，變成毛毛蟲，并以它的臟毛為食。他在那里正式任職長達(dá)整整一代人的時間。 83. Even more shocking is the fact that the number and rate of imprisonment have more than doubled over the past twenty years， and recidivism——that is the rate for rearrest——is more than 60 percent. 更讓人吃驚的事實是監(jiān)禁的數(shù)目和比例在過去的二十年中翻了一番還有余，以及累犯率 ——即再次拘押的比例 ——為百分之六十強。 81. Television the most pervasive and persuasive of modern technologies， marked by rapid change and growth， is moving into a new era， an era of extraordinary sophistication and versatility， which promises to reshape our lives and our world. 電視，這項從迅速變化和成長為標(biāo)志的最普及和最有影響力的現(xiàn)代技術(shù)，正在步入一個新時代，一個極為成熟和多樣化的時代，這將重塑我們的生活和世界。 79. The practice of making excellent films based on rather obscure novels has been going on so long in the United States as to constitute a tradition. 根據(jù)默默無聞的小說制作優(yōu)秀影片在美國由來已久，已經(jīng)成為傳統(tǒng)。 77. Poodles were once used as retrievers in duck hunting， but the American Kennel Club does not consider them sporting dogs because they are now primarily kept as pets. 長卷毛狗曾被用作獵鴨時叼回獵物的獵犬，但是美國 Kennel Club 卻不承認(rèn)它們?yōu)楂C犬，因為它們現(xiàn)在大多數(shù)作為寵物飼養(yǎng)。 75. Though once quite large， the population of the bald eagle across North America has drastically declined in the past forty years. 北美禿頭鷹的數(shù)量一度很多，但在近四十年中全北美的禿頭鷹數(shù)量急劇下降。 74. When Henry Ford first sought financial backing for making cars， the very notion of farmers and clerks owning automobiles was considered ridiculous. 當(dāng)亨利 72. Often very