有毒重金属是主要污染物之一。

The poisonous heavy metal is one of the major pollutants.

youdao

铅仍为西安市蔬菜中的主要污染元素。

The major pollutant element is Pb in vegetables of Xian city.

youdao

但是，仅仅宣称有限排意愿的美国却在一项计划里提议同包括中国在内的所有主要污染国就全球变暖问题展开谈判。

But America, which has also just declared itself willing to limit its emissions, is calling for negotiations on a scheme to tackle global warming involving all big polluters, including China.

youdao