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Climbers, however, must be careful not to pollute the environment.

然而，攀岩者必须注意不要污染环境。

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What can you do to pollute less?

你可以做什么来减少污染？

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Miss Carson questioned the right of industrial companies to pollute without considering the effects on the environment.

VOA: special.2010.03.14

emissions that will continue to pollute the air and affect the earth's climate.

VOA: standard.2010.06.14

The future owners of the houses work together with different building designers to create environmentally safe houses that do not pollute.

VOA: special.2009.03.25

Companies that reduce emissions faster can sell their right to pollute to other companies.

NPR: Calif. Diverges from U.S. with Greenhouse Gas Cuts

It would limit companies' emissions while allowing them to buy and sell permits to pollute.

ECONOMIST: Climate change

But for now, the spill's main political effect has been to pollute the debate about energy.

ECONOMIST: Lexington