英语词汇“coal ball”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	coal ball
释义	coal ball coal ball [′kōl ‚bȯl] (geology) A subspherical mass containing mineral matter embedded with plant material, found in coal seams and overlying beds of the late Paleozoic.
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