碘是机体必需的微量元素，是甲状腺合成甲状腺激素的基本原料。
Iodine is the essential microelement, and the primary material for thyroid to synthesize thyroid hormones.
硒是人体必需的微量元素。
氟是机体必需的微量元素之一，氟与人体生命活动及牙齿、骨骼组织代谢密切相关。
Fluorine is one of the essential microelement of human body. There are close correlation in fluorine and human body life activity, tooth and skeleton constitution metabolism.
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