英语词汇“pillar-and-breast system”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	pillar-and-breast system
释义	pillar-and-breast system pillar-and-breast system [′pil·ər ən ′brest ‚sis·təm] (mining engineering) A system of coal mining in which the working places are rectangular rooms usually five or ten times as long as they are broad, opened on the upper side of the gangway.
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