High mountains and flowing water: be careful when making friends. We should learn from Boya and look for bosom friends in the mountains and rivers.

Sima Qing: I really can't accept the bad news. My tears are like rain, comparable to Sima Qing. Forget one's ancestors by counting the classics: we should pay attention to the study of historical knowledge and avoid jokes about forgetting one's ancestors by counting the classics. Endless: At the concert, the actors' songs are endless.

Rich collection: grandpa Duan's house in the neighborhood has a lot of books, which is simply a small library.