Hybrid cars do little harm to the environment.

混合动力汽车对环境危害不大。

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On the other hand, too many people go to the parks will do harm to the environment.

另一方面，过多的人去公园会对环境造成伤害。

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But it's foolish to do harm to our environment.

但是，破坏环境是愚蠢的。

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But it's foolish to do harm to our environment.

但是，破坏环境是愚蠢的。

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