英语词汇“roof-fall exploitation (caving) hard coal mining”的意思、用法、释义、翻译、读音、例句、短语、词组-英汉翻译词典

单词	roof-fall exploitation (caving) hard coal mining
释义	roof-fall exploitation (caving) hard coal mining [固定建筑物] 顶部下挖式开采（挖陷式），硬煤开采
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