Iron is an indispensable trace element which is easily deficient in human body.
铁是人体必需的和易缺乏的微量元素。
Equilibrium of trace element includes equilibrium of all elements in human body and equilibrium of proportion among various elements.
微量元素的平衡包括整体元素在人体中的平衡，微量元素之间比例的平衡。
Selenium is a required nutrition trace element for human body and animal.
硒是人畜必需的营养性微量元素。
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