amniogenesis

例句：

1. 1. The amniotic sac is the protective layer that surrounds the developing fetus in the womb.
   羊膜囊是包围在子宫内发育中的胎儿的保护层。
2. 2. Amniogenesis plays a crucial role in the development of the fetus.
   羊膜形成在胎儿发育中起着至关重要的作用。
3. 3. During the early stages of pregnancy, amniogenesis is responsible for producing fluids that nourish the fetus.
   在怀孕的早期阶段，羊膜形成负责产生滋养胎儿的液体。