What concerns scientists is the increasing level of pollution in our citics.

科学家关注的是我们中信证券污染水平的日益提高。

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What concerns the scientists is the increasing level of pollution in our citics.

围绕科学家的是城市的污染日益严重。

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What concerns the scientists is the increasing level of pollution in our citics.

围绕科学家的是城市的污染日益严重。

youdao