易混淆的单词： TARS

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Contains no coal or pine tars and no steroids .

不含煤油或是松焦油不含激素。

The composition and structure of two kinds of tars in tientsin gas works were investigated .

本文对天津煤气厂的两种焦油（煤焦油和石油焦油）的组成结构进行了研究。

Mechanism for the formation of hpenolic tars in preparation of diphenols by the hydroxylation of phenol .

苯酚羟基化合成苯二酚反应过程中酚焦油的生成机理。