An ectopic pregnancy, which occurs when a fertilized egg develops outside of the uterus, usually miscarries or is terminated by doctors because of the threat it can cause to the mother.

• 受精卵子是在子宫的外部发育的异常妊娠通常流产或被医生终止妊娠，因为其可能对妊妇构成生命威胁。