英语词汇“second mining”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	second mining
释义	second mining second mining [′sek·ənd ′mīn·iŋ] (mining engineering) In underground coal mining, a procedure in which the pillars left for roof support are removed as mining operations move back out of the previously mined area.
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