1、That xenon could not form chemical compounds was once believed by scientists.
[參考譯文]科學家曾相信：氙氣是不能形成化合物的。
2、153、Although apparently rigid（堅硬的）, bones exhibit a degree of elasticity（彈力，彈性） that enables the skeleton to withstand （承受）considerable impact（衝撞）.
[參考譯文]骨頭看起來是脆硬的，但它也有一定的彈性，使得骨骼能夠承受相當的打擊。
3、Not until 1866 was the fully successful transatlantic cable finally laid.
[參考譯文]直到1866年第一條橫跨大西洋的電纜才完全成功的架通。
4、According to anthropologists, the earliest ancestors of humans that stood upright resembled chimpanzees（黑猩猩） facially, with sloping（傾斜的） foreheads and protruding（突出的） brows.
[參考譯文]根據人類學家的說法，直立行走的人的鼻祖面部輪廓與黑猩猩相似，額頭後傾，眉毛突出。
5、Quails typically have short rounded wings that enable them to spring into full flight instantly（即刻地） when disturbed in their hiding places.
[參考譯文]典型的鵪鶉都長有短而圓的翅膀，憑此他們可以在受驚時一躍而起，飛離它們的躲藏地。
6、No social crusade（改革運動） aroused（喚醒） Elizabeth Williams' enthusiasm more than the expansion（擴充） of educational facilities for immigrants to the United States.
[參考譯文]給美國的新移民增加教育設施比任何社會運動都更多的激發了Elizabeth Williams的熱情。
7、It is the interaction between people, rather than the events that occur in their lives, that is the main focus of social psychology.
[參考譯文]社會心理學的主要焦點是人與人之間的交往，而不是他們各自生活中的事件。
8、The wallflower is so called because its weak stems often grow on walls and along stony cliffs for support.
[參考譯文]牆花之所以叫牆花，是因為其脆弱的枝幹經常要靠牆壁或順石崖生長，以便有所依附。
9、The annual worth of Utah's manufacturing is greater than that of its mining and farming combined（組合的）.
[參考譯文]猶他州製造業的年產值大於其礦業和農業的總和。
10、Because its leaves remain green long after being picked, rosemary became associated with the idea of remembrance（想念）.
[參考譯文]採摘下的迷迭香樹葉常綠不衰，因此人們把迷迭香樹與懷念聯繫在一起。
11、Alexander Graham Bell once told his family that he would rather be remembered as a teacher of the deaf than as the inventor of the telephone.
[參考譯文]Alexander Graham Bell曾告訴家人，他更願意讓後人記住他是聾子的老師，而非電話的發者。
12、Elizabeth Blackwell, the first woman medical doctor in the United States , founded the New York Infirmary（治療所）, an institution that has always had a completely female medical staff.
[參考譯文]美國第一個女醫生Elizabeth Blackwell，創建了一所紐約診所，其全體員工一直以來都是女性。
13、By the middle of the twentieth century, painters and sculptors in the United States had begun to exert a great worldwide influence over art.
[參考譯文]到了二十一世紀中葉，美國畫家和雕塑家開始在世界範圍內對藝術產生重大影響。
14、The mechanism（原理） by which brain cells store memories is not clearly understood.
[參考譯文]大腦細胞儲存記憶的機理並不為人明白。
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