Shortly after implantation the blastocyst wall, the trophoblast, consists of two layers of cells.植入之后不久,胚囊的壁, 即滋养细胞含有两层细胞.The blastocyst is then surgically introduced into the uterus of a foster mother.然后通过手术把胚囊引进寄养母体的子宫...

n.胚泡，胚囊...

blastocyst的音标：blastocyst的英式发音音标为：['blæstəsɪst]blastocyst的美式发音音标为：['blæstəsɪst]...