They can take harmful gas from the air.
它们能带走空气中的有害气体。
The discharge of harmful gas into open air is dangerous.
将有害气体释放到空气中是危险的。
If smoking is harmful to your health, tail gas is much more so.
如果说吸烟对人们的健康有害，那么汽车尾气就更有害了。
If smoking is harmful to your health, tail gas is much more so.
如果说吸烟对人们的健康有害，那么汽车尾气就更有害了。
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