learn the hard way

含义

to find something out through your own mistakes

从自己的错误中吸取教训.

例句

1. 1I learnt the hard way that cheap shoes don't last.
2. 2Many new drivers learn the hard way that parking fines are expensive.
3. 3Ben learnt the hard way to back up his work after losing a whole essay.
4. 4Never lend money to friends without writing it down; I learnt the hard way.
5. 5Why do some people only learn the hard way, even when everyone warns them?

语法

learn 是规则动词：learned，英式英语也用 learnt。学到的内容常用 that 从句接在后面。