微量元素锌是人体所必需的营养元素之一。
Zinc is one of the necessary nutrition microelements for human body.
微量元素是人体必需的极易缺乏的营养元素。
Microelements tonic is one of necessary nutrition of body that very easy to fault.
硒是人畜必需的营养性微量元素。
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 required nutrition trace element for human body and animal.
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