Noun:

1. the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)

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1. A chorionic villus is a minute vascular projection on the fetal chorion.
   绒膜绒毛是胎儿绒毛膜上的一种微小的血管凸出物。
2. After implantation of the blastocyst in the uterine wall the trophoblast divides into two layers, the chorion and the placenta.
   在胚泡植入子宫壁后，胚胎滋养层分成两层，即绒毛膜和胎盘。