placental reaction

例句：

1. 1. The placental reaction is a common side effect ofpregnancy.
   胎盘反应是怀孕的常见副作用。
2. 2. Duringlabor, the placental reaction cancause severe pain and bleeding.
   分娩期间，胎盘反应可能导致剧烈疼痛和出血。
3. 3. The placental reaction is often associated with prematurebirths.
   胎盘反应通常与早产有关。