多环芳烃;稠环芳烃

polycyclic aromatic hydrocarbon的用法和样例：

例句

Polycyclic aromatic hydrocarbons are a group of ubiquitous pollutants.摘要多环芳烃是一类普遍存在的环境污染物。
On Earth, polycyclic aromatic hydrocarbons are found on burnt toast and in automobile exhaust.在地球上，可以在烤土司和汽车尾气中找到多环芳烃。

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