The air in the work is purified of poisonous gases with the machine.
用机器除去工厂里空气中的有毒气体。
The air of the room was purified.
这个房间的空气被净化了。
Why must the tail gas be purified before it is vented out to air?
为什么在尾气排出前要进行净化处理？
Why must the tail gas be purified before it is vented out to air?
为什么在尾气排出前要进行净化处理？
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