Helplessly, the flowers fall away, and the familiar swallow returns.
You smart one, tell me, why are our days gone forever?
I really like the feeling in Yan Shu's "Huanxi Sand". With the withering of flowers, the passing of spring, and the passage of time, the poet can't help but sigh at the inability of beautiful things to reappear. Everything has undergone irreversible changes. This is the long passing years and the people and things related to it.
In fact, life is like this, you can only move forward and there is no room to look back.