In large cities people breathe in dangerous gases from cars and chimneys.

在大城市，人们呼吸时吸入汽车和烟囱排出的有害气体。

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In large cities people breathe in dangerous gases from cars and chimneys.

在大城市，人们呼吸时吸入汽车和烟囱排出的有害气体。

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