很多工厂都让毒气和毒烟排放到空气里。
Many factories allow poisonous gas and smoke to escape into the air.
用机器除去工厂里空气中的有毒气体。
The air in the work is purified of poisonous gases with the machine.
我们必须采取措施阻止工厂排泄有毒气体！
We must take measures to prevent the excretion of toxic gas plant!
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.
从工厂有毒气体也使空气这么脏。
从工厂有毒气体也使空气这么脏。
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