目的：介绍关于微量元素与人体健康的知识。
Objective To introduce the knowledge about trace elements and human health.
目的：微量元素与人体的健康密切相关。
Objective: Trace elements and is closely related to human health.
硒是与人体健康密切相关的必需微量元素之一。
Selenium is one of the trace elements closely related to human health.
硒是与人体健康密切相关的必需微量元素之一。
Selenium is one of the trace elements closely related to human health.
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