第一个本地污染模式是车辆和电厂的混合体。

The first local mode is a combination of local vehicle sources and power stations.

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第一本是关于污染的，第二本是关于美国文化的。

The first one is about pollution, and the second one is about American culture.

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龙井溪水的第一批污染者。

First Polluters of Dragon Well Valley water.

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第一步，解决空气污染的评价。

The first step to solve air pollution is assessment.

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第一步，解决空气污染的评价。

The first step to solve air pollution is assessment.

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