Equilibrium of trace element includes equilibrium of all elements in human body and equilibrium of proportion among various elements.
微量元素的平衡包括整体元素在人体中的平衡，微量元素之间比例的平衡。
Sr, the necessary trace element for human body, is the normal comprisement of bones and teeth.
锶是人体必需的微量元素，是骨骼和牙齿的正常组成部分。
Fluoride is a trace element which human body need, but it can arouse injure on bone System if one who have taken in too much.
氟是人体必需的微量元素，但摄入过量能引起骨相系统损害。
Fluoride is a trace element which human body need, but it can arouse injure on bone System if one who have taken in too much.
氟是人体必需的微量元素，但摄入过量能引起骨相系统损害。
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