trophoblast

例句：

1. 1. The trophoblast is responsible for nourishing the fetus.
   滋养层负责滋养胎儿。
2. 2. During pregnancy, the trophoblast plays a crucial role in nurturing the developing fetus.
   怀孕期间，滋养层在孕育胎儿方面起着至关重要的作用。
3. 3. The study of trophoblast biology has led to new insights into the development and function of thehuman placenta.
   对滋养层生物学的研究已经为人类胎盘的发展和功能提供了新的见解。