They thrive in hazardous waste dumps and in mine tailings, making a meal out of metal.

在危险重重的废料中，在尾矿中，它们以金属为食，日子过得欣欣向荣。

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As there was no evidence that hazardous waste was buried at the mine, investigators speculate that the source of dioxins may be natural, perhaps due to a prehistoric forest fire.

由于没有证据表明该矿埋有危险废物，调查者认为该例二恶英的来源可能是一个自然过程，也许归因于史前森林大火。

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So the safety assessment on mine should be divided into two stages: the assessment on the risk degree of hazardous source and assessment on the integrity of safety assurance system in mine.

因此，对矿山安全程度的评价应该分两段进行，即分为：危险源危险程度的评价和矿山安全保障体系完整性的评价。

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