然而，并不是所有的人都知道噪音也是一种污染，对人类健康也是有害的。
However, not all the people know that noise is also a kind of pollution, and that is harmful to human health, too.
二氧化硫是一种污染物，并且是形成酸雨的主要因素。
Sulphur dioxide is a pollutant and a major contributor to acid rain.
二氧化氮是汽车排放的一种污染物。
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