英语词汇“room-and-pillar”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	room-and-pillar
释义	WordReference Random House Unabridged Dictionary of American English © 2024 room-and-pil•lar (ro̅o̅m′ən pil′ər, rŏŏm′-),USA pronunciation adj. [Mining.] Miningnoting a means of extracting coal or other minerals from underground deposits by first cutting out rooms, then robbing the pillars between them; pillar-and-breast. Cf. longwall.
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