英语词汇“coal tar”的释义、用法及例句翻译-英汉例句词典

词汇	coal tar
例句	Petroleum is a derivative of coal tar.石油是煤焦油的衍生物。Petroleum is derived from coal tar and used to make gasoline.石油衍生自煤焦油，用来生产汽油。If coal is heated in the absence of air, coal tar is produced.在隔绝空气的状态下加热煤，便会产生煤焦油。
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