Retroactive effect
[经] 有追溯效力
🧩 词语组成解析
🗣️ 情景例句
Just because the other kids have motor scooters is no reason for you to stop riding your bike to school.
只是因为其他的孩子都有电单车上学，不足以成为你不骑车上学的理由。
I will have done it by the time you come back.
在你回来之前，我会做完它。[将来完成时，表示将完成…，会做完…]
Unfortunately it will cost a lot of money.
遗憾的是，这要花很大一笔钱。