大量的废纸最终被丢进垃圾堆，甚至废物填埋场，在那里会产生有害气体。

A great deal of wastepaper ends up in rubbish and even landfills, where it can produce harmful gases.

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多亏了化学，我们知道漂白剂不能和醋混合，因为这种混合物会产生有害气体。

Thanks to chemistry, we know bleach can't be mixed with vinegar, because the mixture can produce harmful gas.

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镍在精炼过程中不产生有害气体和粉尘，没有废渣。

There are no hazardous gases, dusts, residues and slags produced during nickel refining.

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