Another key culprit: environmental pollutants.
另一个元凶则是环境污染。
Lead is one of the major heavy metal pollutants in the environmental water system.
铅是环境水体中的主要重金属污染物之一。
Studying the environmental effects of toxic air pollutants is currently very important in the world.
有毒有害空气污染物的环境影响是国内外研究的热点，而机动车排放是其重要源之一。
Studying the environmental effects of toxic air pollutants is currently very important in the world.
有毒有害空气污染物的环境影响是国内外研究的热点，而机动车排放是其重要源之一。
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