怀孕期间突然发生的胎盘剥离是一种危险的医疗急症。

The sudden ___abruption of the placenta during pregnancy is a dangerous medical emergency.

医生警告她胎盘早剥的风险，建议减少剧烈运动。

The doctor warned her about the risk of placental ___abruption and advised against strenuous activities.