Iron is essential for the formation of haemoglobin, the red pigment in blood.
铁是必不可少的组成血红蛋白，红色颜料在血液。
Red blood cell: a specialized cell, full of haemoglobin, which carries oxygen in the blood.
红细胞—血液中含有血红蛋白的特殊细胞，携带氧气。
Red blood cell: a specialized cell, full of haemoglobin, which carries oxygen in the blood.
红细胞—血液中含有血红蛋白的特殊细胞，携带氧气。
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