英语词汇“pillar extraction”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 extraction
释义	pillar extraction pillar extraction [′pil·ər ik′strak·shən] (mining engineering) Removal of the pillars of coal left over from mining by the pillar-and-stall method. Also known as pillar mining.
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