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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時高於液態。

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

大腦細胞儲存記憶的機理並不為人明白。

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.

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。

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

伊麗莎白市，一個重要的航運和製造業中心，坐落於新澤西州的東部。

28. Elizabeth Blackwell, the first woman medical doctor in the United States, founded the New York Infirmary, an institution that has always had a pletely female medical staff.

Elizabeth Blackwell，美國第一個女醫生，創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.

Alexander

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