placental gonadotropin

例句：

1. 1. The placental gonadotropin levels in the mother's blood are crucial for the fetus's growth and development.
   母亲血液中的胎盘促性腺激素水平对胎儿的生长和发育至关重要。
2. 2. Researchers have discovered that certain placental gonadotropins can stimulate the production of breastmilk.
   研究人员发现某些胎盘促性腺激素可以刺激乳汁的产生。
3. 3. The study suggests that placental gonadotropins may play a role in the regulationof fertility.
   研究表明，胎盘促性腺激素可能在调节生育方面发挥作用。