What is the author's most regretful poem in a long line?

1. In the long song line, the author's emotional poem is: "Young people who don't work hard are sad."

2, "Long Songs" Han Yuefu

The trees in the garden are lush, and the crystal dew rises in the sun.

Spring fills the earth with hope, and everything presents a scene of prosperity.

I am always afraid that when the cold autumn comes, the trees in Ye Er will turn yellow and the grass will wither.

The river runs to the sea, and when will it return to the west?

A lazy youth, a lousy age.

3. Long Songs is a folk song of Yuefu in Han Dynasty. The last poem is that if young people don't work hard, old people will be sad. Express the poet's feelings about the passage of time and encourage the world to cherish time and make a difference. Encourage young people to cherish time. If they don't work hard when they are young, it is useless to regret and grieve when they are old.