英语词汇“down-the-hole shaft boring machine”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	down-the-hole shaft boring machine
释义	down-the-hole shaft boring machine 井筒掘进机; 又称“沉入式钻井机”。沿已凿井筒沉入地下钻凿井筒的机器。
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