Cadmium is one of the most toxic heavy metals and is not an essential nutrient element for plant, animal and human being.
镉是动物和植物的非必需元素，也是毒性最大的重金属之一。
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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