胎盘胎膜残留
retained placenta
Retained placental fragment
沉积灰岩岩墙
limestone neptunian dykes
砂岩岩脉（岩墙、岩床）
cause of a serious disease
变形胎盘细胞
Amoeboid blastodermic cell
部分胎盘滞留
retention of placenra fragment
侧前位胎盘
Placenta praevia partialis
Placenta praevia lateralis
超声波定位胎盘
ultrasonic localization of placenta
超细轮胎胎面胶粉
ultra -fine tyre rubber powder