There is a road in the mountain of books, but there is no limit to learning the sea.

A lazy youth, a lousy age.

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.

The book has its own golden house, and the book has its own Yan Ruyu.

Plum blossom fragrance comes from bitter cold, and the sword edge comes from sharpening.