1. Those who have been slapped get a break, and those who have experienced it gain wisdom. -"Five Dynasties Han History Pinghua"

2. Yin Jian is not far away, in Xia Hou's world. -The Book of Songs

A fox can't catch it twice in the same trap. -England

People who study life can learn from life. -Klyuchevski?

5. Sex should be taught slowly to be good. Ok, the lesson is ok. -Jane Corsos

I can teach twenty people a lesson and tell them what to do, but if I want to be one of these twenty people and finish my lesson, I will be insensitive. -Shakespeare

7, the past is not as good as the present, and it can still play a warning role for newcomers. -Wang Anshi

8. A painful experience is always the most powerful lesson. -Latin America

9. The person who scalds his mouth blows the soup before drinking it. -Germany

10, whoever cheats the same person twice should be killed. -England?

1 1, injured people know best where their injuries are. Europe?

If no one teaches us the lesson of failure, we will accomplish nothing. The trajectory of our thinking is to choose between right and wrong, and the frequency of wrong choice and correct choice is equal. Lewis thomas

Any lesson is learning. -Turkey

14, a lesson from the past. —— Ban Gu

15, with the experience of going the wrong way, it will be smooth to come back. -France