A lazy youth, a lousy age.

Jade is not cut, not a tool; People don't learn and don't know what it means.

Every day when the cock crows, it is the best time for boys to read.

Teenagers only know how to play, but don't know how to study hard. When they are old, they regret why they didn't know how to study hard when they were young.

Don't be idle, white and sad!

The answer is not easy to adopt. If you need more, please ask. ...