Much of the complex would naturally be filled with scorching water, were it not for industrial pumps that facilitate the mining of silver, zinc, lead, and other minerals in the caves.
洞穴中大多充满灼热的水，因而给利用工业泵在其中进行银、锌、铅等矿物的开采增加了难度。
2
The Rocky Mountains are littered with ghost towns that were once thronged with men mining silver, lead or uranium.
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