11. Acids are chemical compounds that，in water solution，have a sharp taste，a corrosive action on metals，and the ability to turn certain blue vegetable dyes red. 酸是一種化合物，它在溶于水時(shí)具有強(qiáng)烈的氣味和對金屬的腐蝕性，并且能夠使某些藍(lán)色植物染料變紅。

　　12. Billie Holiday's reputation as a great jazz-blues singer rests on her ability to give emotional depth to her songs. Billie Holiday作為一個(gè)爵士布魯斯樂杰出歌手的名聲建立在能夠賦予歌曲感情深度的能力。

　　13. Essentially，a theory is an abstract，symbolic representation of what is conceived to be reality. 理論在本質(zhì)上是對認(rèn)識(shí)了的現(xiàn)實(shí)的一種抽象和符號(hào)化的表達(dá)。

　　14. Long before children are able to speak or understand a language，they communicate through facial expressions and by making noises. 兒童在能說或能聽懂語言之前，很久就會(huì)通過面部表情和靠發(fā)出噪聲來與人交流了。

　　15. Thanks to modern irrigation，crops now grow abundantly in areas where once nothing but cacti and sagebrush could live. 受當(dāng)代灌溉(技術(shù)設(shè)施)之賜，農(nóng)作物在原來只有仙人掌和蕎屬科植物才能生存的地方旺盛的生長。

　　16. The development of mechanical timepieces spurred the search for more accurate sundials with which to regulate them. 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. 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. 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. 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. 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。

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