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。
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。
Essential trace element is indispensable in maintaining body health.
必需微量元素在维持机体健康方面是不可或缺的。
Fluorin element is one of 14 necessary trace elements in body.
氟是人体必需的14种微量元素之一。
Selenium is a trace element essential to human body.
硒是人体必需微量元素。
Selenium is a trace element essential to human body.
硒是人体必需微量元素。
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