This is the most common element in the universe and so could come from many sources, but the fact that it tends to coincide with heavy-element pollution is telling.
氢是宇宙中最普遍的元素，可以有多种来源，但是它总是倾向于与重元素污染并存这一事实才是关键。
The earthworm had a very strong ability to concentrate the heavy metal element, and the ability increased along with the increase of soil metal pollution.
蚯蚓对重金属元素具有很强的富集能力，且随土壤污染程度增加而增加。
The environmental pollution caused by cadmium, a heavy metal toxic element, has aroused geologists' attention.
镉是重金属有毒元素，其环境污染一直是众多学者研究的焦点。
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