英语词汇“pillar-and-room system”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	pillar-and-room system
释义	pillar-and-room system pillar-and-room system [′pil·ər ən ′rüm ‚sis·təm] (mining engineering) A system of mining whereby solid blocks of coal are left on either side of working places to support the roof until first-mining has been completed, when the pillar coal is then recovered.
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