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 Sketch Coloring Page

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

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