What is the famous sentence in the poem "Long Songs"?

The famous sentence in Long Songs is: "Young people who don't work hard are sad."

The original text is as follows:

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.

A hundred rivers go east to the sea, when will they return to the west?

A lazy youth, a lousy age.

The translation reference is as follows:

In the morning, there are green sunflowers in the garden, glittering and translucent morning dew waiting for the sun to dry.

Spring scatters the hope of happiness all over the earth, so all living things are thriving.

I often worry that when the cold autumn comes, flowers and leaves will turn yellow and wither.

Thousands of rivers flow eastward into the sea. When can they flow back to the west?

If you don't know how to be strong when you are young, you will be white-haired and accomplish nothing when you are old, and it is useless to be sad again.

This poem is selected from Han Yuefu. Yuefu is a royal musical organ established since the Qin Dynasty. During the period of Emperor Wu of the Han Dynasty, a large number of poems were collected from the people, which were rich in content and wide in subject matter. This poem is one of them.

reference data

Ancient Poetry Network: http://www.gushiwen.org/GuShiWen_ab18ab0a9c.aspx.