Phosphorus was the nutrient element limiting the eutrophication of the lake. 磷是湖泊富营养化的限制性营养元素。
Selenium is not only a kind of essential nutrient element for human being and animals, but it is also indispensable in plant growth. 摘要微量元素硒不仅是人和动物必需的营养元素，也是植物生长发育不可缺乏的元素。
