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-现代词典

单词	room-and-pillar
释义	room-and-pillar room-and-pillar [′rüm ən ′pil·ər] (mining engineering) A system of mining in which the coal or ore is mined in rooms separated by narrow ribs or pillars; pillars are subsequently worked.
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