| 31. | A rubber ball attached to a paddle by an elastic string loses energy as it files away from the paddle. |
| 一根弹性绳把一只皮球拴在一块叶片上当球飞离叶片时，球失去能量。
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| 32. | This tree produces rubber . |
| 这些树生产橡胶。
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| 33. | Glass can not conduct electricity. No more can rubber . |
| 玻璃不导电。橡胶也不导电。
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| 34. | He does very good business in rubber goods. |
| 他的橡胶制品生意做得很兴隆。
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| 35. | Some swimmers wear rubber plugs in their ears. |
| 有些游泳的人耳朵里在橡皮塞。
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| 36. | Rubber stretches easily. |
| 橡胶容易拉长。
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| 37. | papers kept together with a rubber band |
| 用橡皮筋套在一起的文件
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| 38. | acrid fumes from burning rubber |
| 燃烧橡胶的刺鼻浓烟
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| 39. | rubber gloves for washing up |
| 洗涤用的胶皮手套
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| 40. | an electric cable insulated with rubber |
| 用橡胶作绝缘材料的电缆
|