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词汇 煤焦油
分类 英语词汇 英汉例句词典
释义 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Petroleum is a derivative of coal tar.石油是煤焦油的衍生物。
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