Toxic heavy metals
有毒重金属
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有毒重金属是主要污染物之一。
The poisonous heavy metal is one of the major pollutants.
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有毒重金属是重要的污染物之一。
The poisonous heavy metal is one of pollutants.
有毒重金属的含量均低于国家标准。
The contents of toxic heavy metals were lower than national standards.
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