英语词汇“longwall 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	longwall system
释义	longwall system longwall system [′lȯŋ‚wȯl ‚sis·təm] (mining engineering) A method of mining in which the faces are advanced from the shaft toward the boundary, and the roof is allowed to cave in behind the miners as work progresses.
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