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１ 骨发育人类骨骼的生长是从宫内开始直到成熟期的一个较长时期的动态持续过程。成熟骨重量的６０％是矿物质，主要由钙盐构成。出生时新生儿骨的含钙量占体重１％左右，约２５～３０ｇ；成人骨含量约１２００ｇ，比新生儿期增加了４０倍。人们将骨骼中矿物质沉积量的多少称
1 Bone development Human bone growth is a dynamic continuation of a longer period from inception in the uterus until maturation. Sixty percent of the mature bone weight is mineral, consisting mainly of calcium salts. Calcium content of neonatal bone at birth about 1% of body weight, about 25 ~ 30g; adult bone content of about 1200g, an increase of 40 times than the neonatal period. People will be skeletal deposits of minerals called how much