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	WordReference Random House Unabridged Dictionary of American English © 2024 coal′ ball′, Mining, Mineralogya spherical mass of mineral and plant material embedded in coal beds, ranging in size from that of a pea to that of a boulder. 1735–45
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