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。
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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