有毒重金属是主要污染物之一。

The poisonous heavy metal is one of the major pollutants.

youdao

有毒重金属是重要的污染物之一。

The poisonous heavy metal is one of pollutants.

youdao

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.

youdao

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.

youdao