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。
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Researchers have warned that multivitamins, minerals and other dietary supplements can lull users into a false sense of security - and lead to them over-indulging in unhealthy foods and activities.
Professor Edgar Hertwich, the lead author of the report, said: "Animal products cause more damage than [producing] construction minerals such as sand or cement, plastics or metals."