使用电梯下至地下矿井。
实验在美国南达·科塔州的荷马·斯塔克(Homestake)地下矿井内进行。
It is being housed underground at the Homestake mine in South Dakota, us.
地下矿井中的防爆和保护。保护系统。第4部分：掘进机用自动灭火系统。
Explosion prevention and protection in underground mines - Protective systems - Part 4: automatic extinguishing systems for road headers.
露天矿场里面的矿物可以用重型机械成吨地开采，但是地下矿井里面得用镐费力地挖出来。
Minerals in open-pit mines are excavated by the ton with heavy equipment, but underground they are often extracted painstakingly with pickaxes.
矿坑涌水直接危及地下矿山矿井安全，保障矿山安全渡汛是地下矿山的重大课题。
The gush-out water in the mineral pit endangers the underground mine safety directly.
矿坑涌水直接危及地下矿山矿井安全，保障矿山安全渡汛是地下矿山的重大课题。
The gush-out water in the mineral pit endangers the underground mine safety directly.
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