Copper are both an essential nutrition element for crops and a heavy metallic element polluting the environment.
铜是作物生长发育必需的营养元素，也是污染环境的重金属元素。
After the soil is polluted by the heavy metallic element, these harmful elements will enter finally the human body through the food chain, which will do harm to the human health.
因为土壤被重金属元素污染后，这些有害元素将通过食物链最终进入人体，对人体健康造成危害。
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