对照组为该市非工业污染文化社区。
Community not polluted by industry was chosen to serve as control.
眼下我们要密切注意文化污染。
We should watch out for the cultural pollution closely for the time being.
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.
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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