opening up by vertical shafts是什么意思


中文翻译竖井开拓

网络释义

1)opening up by vertical shafts,竖井开拓2)shaft excavation,竖井开挖3)excavating shaft,开挖竖井4)to put down a shaft,开掘竖井5)excavation of tunnel,井巷开拓6)vertical shaft development,立井开拓

用法例句

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