Hence more effort was directed to beneficiate the ores.
因此，对于矿石的富集人们做了更多的努力。
Since heavy metal is easy to pass food chain but living things beneficiate, to living things and the human body, healthy graveness threatens formation.
由于重金属易通过食物链而生物富集，构成对生物和人体健康的严重威胁。
Since heavy metal is easy to pass food chain but living things beneficiate, to living things and the human body, healthy graveness threatens formation.
由于重金属易通过食物链而生物富集，构成对生物和人体健康的严重威胁。
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