2.一般来说怀孕到第8�时胚胎已经�现出人的形态.怀孕期间胎儿的营养物质和废物都是通过胎盘和脐带与母体进行交换而获得和排出的.——青夏 Template




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tomski2.一般来说怀孕到第8�时胚胎已经�现出人的形态.怀孕期间胎儿的营养物质和废物都是通过胎盘和脐带与母体进行交换而获得和排出的.——青夏 coloring