胎膜

例句：

1. 1. The fetal membranes protect the developing baby inside the uterus.
   胎盘膜保护着子宫内正在发育的婴儿。
2. 2. During pregnancy, the amnion and chorion form a protective barrier around the baby.
   怀孕时，羊膜和绒毛膜形成一种保护屏障围绕在宝宝周围。
3. 3. The amnion is the outer layer of the placenta that provides nutrients to the fetus.
   羊膜是胎盘的最外层，为胎儿提供养分。