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.
随便看	fncvd fnd fnd2 fnd3 fnda fndae fndai fndat fndb fndba fndc fndcv fndd fndds fnde critical states critical state soil mechanics critical strain critical stress area critical stress ratio critical structural details critical structure protection initiative critical studies in food and culture critical success factor critical success factors for institutional change

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