21、Essentially, a theory is an abstract, symbolic representation of what is conceived to be reality.

　　理論在本質上是對認識了的現實的一種抽象和符號化的表達。

　　22、Thanks to modern irrigation, crops now grow abundantly in areas where once nothing but cacti and sagebrush could live.

　　受當代灌溉(技術設施)之賜，農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。

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

　　機械計時器的發(fā)展促使人們尋求更精確的日晷，以便校準機械計時器。

　　24、Anthropology is a science in that anthropologists use a rigorous set of methods and techniques to document observations that can be checked by others.

　　人類學是一門科學，因為人類學家采用一整套強有力的方法和技術來記錄觀測結果，而這樣記錄下來的觀測結果是供他人核查的。

　　25、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，而腐化過程將化學物質回饋于土壤，提高其肥力，并分解動物糞便。

　　26、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，產生幾乎純質的音調，其音量經久不衰。

　　27、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。

　　28、Eliminating problems by transferring the blame to others is often called scape-goating.

　　用怪罪別人的辦法來解決問題通常被稱為尋找替罪羊。

　　29、The chief foods eaten in any country depend largely on what grows best in its climate and soil.

　　一個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。

　　30、Over a very large number of trials, the probability of an event’s occurring is equal to the probability that it will not occur.

　　在大量的實驗中，某一事件發(fā)生的幾率等于它不發(fā)生的幾率。

　　31、Most substance contract when they freeze so that the density of a substance’s solid is higher than the density of its liquid.

　　大多數物質遇冷收縮，所以他們的密度在固態(tài)時高于液態(tài)。

　　32、The mechanism by which brain cells store memories is not clearly understood.

　　大腦細胞儲存記憶的機理并不為人明白。

　　33、By the middle of the twentieth century, painters and sculptors in the United States had begun to exert a great worldwide influence over art.

　　到了二十一世紀中葉，美國畫家和雕塑家開始在世界范圍內對藝術產生重大影響。

　　34、In the eastern part of New Jersey lies the city of Elizabeth, a major shipping and manufacturing center.

　　伊麗莎白市，一個重要的航運和制造業(yè)中心，坐落于新澤西州的東部。

　　35、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.

　　Elizabeth Blackwell，美國第一個女醫(yī)生，創(chuàng)建了員工一直為女性紐約診所。

　　36、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.

　　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。

　　37、Because its leaves remain green long after being picked, rosemary became associated with the idea of remembrance.

　　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系在一起。

　　38、Although apparently rigid, bones exhibit a degree of elasticity that enables the skeleton to withstand considerable impact.

　　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。

　　39、That xenon could not FORM chemical compounds was once believed by scientists.

　　科學家曾相信：氙氣是不能形成化合物的。

　　40、Research into the dynamics of storms is directed toward improving the ability to predict these events and thus to minimize damage and avoid loss of life.

　　對風暴動力學的研究是為了提高風暴預測從而減少損失，避免人員傷亡。

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