Studies also show that most of mercury in coal can be brought into the environment easily by acid mine drainage (AMD), and this kind of pollution should be paid more attention to.

研究表明，当煤炭被开采堆放到地表后，煤中大部分汞可以被酸性矿井水带入环境中，这一环境污染问题应予以重视。

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Studies also show that most of mercury in coal can be brought into the environment easily by acid mine drainage (AMD), and this kind of pollution should be paid more attention to.

研究表明，当煤炭被开采堆放到地表后，煤中大部分汞可以被酸性矿井水带入环境中，这一环境污染问题应予以重视。

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