工厂废气、污水排放到年底必须符合排放标准。

All factories must meet discharge standards by the end of this year.

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一些工厂往河里排放污水或有毒气体。

Some factories send waste water into river and poisonous gas into the air.

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一些工厂往河里排放污水或有毒气体。

Some factories send waste water into river and poisonous gas into the air.

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