英语词汇“tunnel system”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	tunnel system
释义	tunnel system tunnel system [′tən·əl ‚sis·təm] (mining engineering) A method of mining in which tunnels or drifts are extended at regular intervals from the floor of the pit into the ore body.
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