| 1. | Let's take cars for example. They not only pollute the air in cities, but make them crowded. Furthermore, they are responsible for a lot of traffic accidents. The noise made by cars disturbs the residents living on both sides of streets all day and night. |
| 就拿汽车为例。汽车不仅污染城市空气，而且使城市拥挤不堪。此外，汽车造成许多交通事故。汽车所产生的噪音使居住在街道两旁的居民日夜不得安宁。
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| 2. | pollute the minds of the young with foul propaganda |
| 宣传不良事物腐蚀青年人的思想
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| 3. | pollute the air |
| 污染空气
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| 4. | contaminate [ pollute ] the environment |
| 污染环境
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| 5. | pollute water |
| 污水染水
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