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Water pollution reduces the amount of pure, fresh water that is available for such necessities as drinking and cleaning, and for such activities as swimming and fishing.

水污染使得我们用来饮用和清洗的纯净新鲜的水资源不断减少，用于游泳、垂钓的水源也在减少。

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The pollution and the cleaning of the membrane were also discussed.

同时讨论了双极膜的污染和清洗问题。

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It's an alliance of state governments that works on cleaning air pollution.

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In general we say that the polluter should pay, the polluter should pay the costs of cleaning up the pollution they cause.

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The "greening" of Chengdu created 500, 000 jobs, nearly tripling the per capita income in the region, and included the cleaning up or closing of more than 1, 000 commercial sources of pollution.

CNN: 'The smelly sewer of Chengdu'