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受精完成,标志一个新生命的开始。包括人在内的哺乳动物,这个新生命经过倍数卵裂而形成桑葚胚,继续发育成囊胚后分化出具有侵袭能力的滋养细胞而完成胚胎的母体子宫内植入,约在妊娠的9~12周,胎儿与母体建立起物质的血液性交换关系,胚胎及胎儿从此获得母体的血液性营养供给。在?
Fertilization is completed, marking the beginning of a new life. Including human mammals, the new life after multiple cleavage and the formation of morulae, continue to develop into a blastocyst after the differentiation of invasive trophoblast cells and the completion of embryonic mother’s intrauterine implantation, about 9 ~ 12 weeks, the fetus and the mother establish the material blood exchange relationship, the fetus and fetus from the mother’s blood supply of nutrients. in?