placental fold

例句：

1. 1. The placental fold is a unique structure in the human fetus that plays a crucial role in the development of the fetus.
   胎盘褶皱是人类胎儿中独特的结构，对胎儿的发展起着至关重要的作用。
2. 2.During pregnancy, the placental folds grow and expand to provide amniotic fluid for the developing fetus.
   怀孕期间，胎盘褶皱会生长并扩张，为发育中的胎儿提供羊水。
3. 3.Researchers have found that the placental folds are responsible for transferring nutrients and oxygen from the mother's blood to the fetus's blood.
   研究人员发现，胎盘褶皱负责将母亲血液中的营养物质和氧气传递给胎儿血液。