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。
Zinc is an essential nutrient element for biological organisms, but it is toxic to plant, animal and human at excess levels.
锌是生物必需微量元素，但过多时对动植物都有毒害。
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