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.
随便看	dpoah dpoahc dpob dpobu dpoc dpocc dpocl dpod dpodm dpodp dpoe dpof dpog dpoh dpoi dpok dpol dpolg dpolp (d)polsk dpolsk dpom dpo-ma dpomd dpon

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