changeback

例句：

1. 3. 例句：1. He changedback the clothes he had worn yesterday.
   他换回了昨天穿过的衣服。
2. 2. Thecompany decided to change backits policy after a year.
   公司决定在一年后改变其政策。
3. 3. Shechanged back her old phone number to avoidany confusion.
   她把旧电话号码换回来以避免混淆。