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钙是人体中含量最丰富的必需元素，是多种生理活动的参与者。针对当今“人体补钙”这一热门话题，本文从化学的角度，重点介绍了人体中钙的分布、存在形式及其功能等人们所关心的内容。
Calcium is the most abundant essential element in the human body and is a participant in a variety of physiological activities. In view of the hot topic of “human calcium supplement” today, this article focuses on the distribution of calcium in the human body from chemical point of view, its existing forms and functions, and so on.