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铁是研究最多和了解最深的人体必需微量元素之一，亦是体内含量最多的一种微量元素。几乎无处不有，是维持生活、生命需氧的代谢条件必不可少的矿物质。借助于红细胞膜等受体，由细胞内血红蛋白从肺吸入氧气（即在肺内释放二氧化碳后的还原血红蛋白，乃与之结合由肺吸入的氧成
Iron is one of the most essential microelements and one of the most abundant trace elements in the body. Almost everywhere, is the essential mineral that sustains the metabolic conditions vital to life and life. By means of receptors such as the erythrocyte membrane, oxygen is taken from the lungs by intracellular hemoglobin (that is, reduced hemoglobin after the release of carbon dioxide in the lungs is bound to the oxygen inhaled by the lung