placental lobules

例句：

1. 1.The placental lobules are responsible for the exchange of nutrients between mother and fetus.
   胎盘小叶负责母亲和胎儿之间的营养物质交换。
2. 2.During labor, the placental lobules undergo significant changes in size and shape.
   在分娩过程中，胎盘小叶会发生显著的大小和形状变化。
3. 3. Researchers have been studying the function of placental lobules since the 19th century.
   自19世纪以来，研究人员一直在研究胎盘小叶的功能。