circumvallate placenta

例句：

1. 1.The circumvallate placenta plays a crucial role in the development of the fetus.
   环绕胎盘在胎儿发育中起着至关重要的作用。
2. 2. The circumvallate placenta is responsible for the transfer of nutrients and oxygen to the fetus.
   环绕胎盘负责将营养物质和氧气传递给胎儿。
3. 3. The circumvallate placenta is also important for the regulation of hormone levels during pregnancy.
   环绕胎盘还对怀孕期间激素水平进行调节。