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岩石巷道
gen. deading; tunnel
岩石巷道简称“岩巷”。在掘进断面中，岩石面积占全部或绝大部分〈一般大于4/5 ＞的巷道
expl. rock drift
岩石 巷道: 1 phrase in 1 subject
Technology1

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