retained placenta

• 胎盘滞留,胎衣滞留,滞留胎盘,牢固胎盘

retained placenta的用法和样例：

例句

1. I was told that the placenta remained in the uterus for almost half an hour.
   她们告诉我说是因为胎盘滞留在子宫内将近半小时。