Iron is a nutritional element to both man and plant.
铁是植物和人类共同需求的营养元素。
Phosphorus was not only the essential nutritional element for plants and animals, but also significant factor of environment pollution.
磷不但是动植物必需的营养元素，也是重要的环境污染因子。
Phosphorus was not only the essential nutritional element for plants and animals, but also significant factor of environment pollution.
磷不但是动植物必需的营养元素，也是重要的环境污染因子。
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