Our country is trying hard to prevent and control air pollution.

我们的国家正努力预防和控制空气污染。

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To prevent the hard floor from being felt, he made the couch twice as thick.

为了不被坚硬的地板硌着，他把床做厚了一倍。

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To prevent the hard floor from being felt, he made the couch twice as thick.

为了不被坚硬的地板硌着，他把床做厚了一倍。

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