英语词汇rock coal怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	rock coal
释义	Definition of rock coal in English: rock coal noun US rare A hard form of coal; anthracite. Origin Mid 18th century. Definition of rock coal in US English: rock coal noun US rare A hard form of coal; anthracite. Origin Mid 18th century.
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Definition of rock coal in English: