86. 人造花卉即可用于科学目的，也可用于装饰目的，它们可以用各种各样的材料制成，臂如蜡和玻璃;其制作如此精巧，几乎可以以假乱真。
Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as way and glass, so skillfully that they can scarcely be distinguished from natural flowers.

69. 雪对农民是一种帮助，因为它保持地层土壤的温度，使种子不致冻死。
Snow aids farmers by keeping heart in the lower ground levels, thereby saving the seeds from freezing.

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27. 伊丽莎白市，一个重要的航运和制造业中心，坐落于新泽西州的东部。
In the eastern part of New Jersey lies the city of Elizabeth, a major shipping and manufacturing center.

71. 史前的人们制造颜料是将植物和泥土等原料磨成粉末，然后加水。
People in prehistoric times created paints by grinding materials such as plants and clay into power and then adding water.

50. 北美远古的Hopewell人很可能种植了玉米和其他农作物，但打猎和采集对他们的经济贸易仍是至关重要的。
The ancient Hopewell people of North America probably cultivated corn and other crops, but hunting and gathering were still of critical importance in their economy.

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88. 当有关西部铁路的说服和规划工作终于完成后，真正艰难的任务还没有开始;即危险，吃力，需要伤筋动骨和吵吵嚷嚷的建造这些铁路的实际工作。
When the persuading and the planning for the western railroads had finally been completed, the really challenging task remained: the dangerous, sweaty, backbreaking, brawling business of actually building the lines.

39. 大陆分水岭是指北美洛矶山脉上的一道想象线，该线把大西洋流域和太平洋流域区分开来。
The continental divide refers to an imaginary line in the North American Rockies that divides the waters flowing into the Atlantic Ocean from those flowing into the Pacific.

32. 科学家曾相信：氙气是不能形成化合物的。
That xenon could not FORM chemical compounds was once believed by scientists.

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90. 美国宪法要求总统是生于美国本土的公民，三十五岁以上，并且在美国居住了至少十四年。
The United States Constitution requires that President be a natural-born citizen, thirty-five years of age or older, who has lived in the United States for a minimum of fourteen years.

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66. 鲇鱼不仅可以离开水存活，还可以在岸上短距离移动。
Not only can walking fish live out of water, but they can also travel short distances over land.