substitute mother

例句：

1. 1. She was a substitute motherto her children during their father'sabsence.
   在她父亲缺席期间，她成了孩子们的替代母亲。
2. 2.The new policy allows for thesubstitution of old equipment with new ones.
   新政策允许用旧设备替换新设备。
3. 3.He was a substitute mother to his sister, providing care and support when she neededit most.
   他成为了妹妹的替代母亲，在她最需要的时候提供了照顾和支持。