16.機(jī)械計(jì)時(shí)器的發(fā)展促使人們尋求更精確的日晷，以便校準(zhǔn)機(jī)械計(jì)時(shí)器。
　　17. Anthropology is a science in that anthropologists use a rigorous set of methods and techniques to document observations that can be checked by others.
　　17.人類學(xué)是一門科學(xué)，因?yàn)槿祟悓W(xué)家采用一整套強(qiáng)有力的方法和技術(shù)來記錄觀測結(jié)果，而這樣記錄下來的觀測結(jié)果是供他人核查的。
　　18. Fungi are important in the process of decay, which returns ingredients to the soil, enhances soil fertility, and decomposes animal debris.
　　18.真菌在腐化過程中十分重要，而腐化過程將化學(xué)物質(zhì)回饋于土壤，提高其肥力，并分解動(dòng)物糞便。
　　19. When it is struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period of time.
　　19.音叉被敲擊時(shí)，產(chǎn)生幾乎純質(zhì)的音調(diào)，其音量經(jīng)久不衰。
　　20. Although pecans are most plentiful in the southeastern part of the United States, they are found as far north as Ohio and Illinois.
　　20.雖然美洲山河桃樹最集中于美國的東南部但是在北至俄亥俄州及伊利諾州也能看見它們。
　　21. Eliminating problems by transferring the blame to others is often called scape-goating.
　　21.用怪罪別人的辦法來解決問題通常被稱為尋找替罪羊。
　　22. The chief foods eaten in any country depend largely on what grows best in its climate and soil.
　　22.一個(gè)國家的主要食物是什么，大體取決于什么作物在其天氣和土壤條件下生長得最好。
　　23. Over a very large number of trials, the probability of an event's occurring is equal to the probability that it will not occur.
　　23.在大量的實(shí)驗(yàn)中，某一事件發(fā)生的幾率等于它不發(fā)生的幾率。
　　24. Most substance contract when they freeze so that the density of a substance's solid is higher than the density of its liquid.
　　24.大多數(shù)物質(zhì)遇冷收縮，所以他們的密度在固態(tài)時(shí)高于液態(tài)。
　　25. The mechanism by which brain cells store memories is not clearly understood.
　　25.大腦細(xì)胞儲(chǔ)存記憶的機(jī)理并不為人明白。
　　26. By the middle of the twentieth century, painters and sculptors in the United States had begun to exert a great worldwide influence over art.
　　26.到了二十一世紀(jì)中葉，美國畫家和雕塑家開始在世界范圍內(nèi)對(duì)藝術(shù)產(chǎn)生重大影響。
　　27. In the eastern part of New Jersey lies the city of Elizabeth, a major shipping and manufacturing center.
　　27.伊麗莎白市，一個(gè)重要的航運(yùn)和制造業(yè)中心，坐落于新澤西州的東部。
　　28. Elizabeth Blackwell, the first woman medical doctor in the United States, founded the New York Infirmary, an institution that has always had a completely female medical staff.
　　28. Elizabeth Blackwell，美國第一個(gè)女醫(yī)生，創(chuàng)建了員工一直為女性紐約診所。
　　29. 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.
　　29. Alexander Graham Bell曾告訴家人，他更愿意讓后人記住他是聾子的老師，而非電話的發(fā)明者。
　　30. Because its leaves remain green long after being picked, rosemary became associated with the idea of remembrance.
　　30.采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(lián)系在一起。

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