I am Cheng Youzhu in Song Dynasty.

Teenagers are easy to get old but difficult to learn,

An inch of time is not light.

I didn't feel the dream of spring grass in the pond,

The leaves in front of the steps have sounded in autumn.

1 means: Time is fleeting. If you don't cherish your youth, you will grow old. If you want to study when you are old, it will be too late. Don't underestimate even a little time. Spring has just arrived, and I haven't noticed that the spring grass is green. Before I opened my eyes, the leaves of the plane in front of the steps had turned yellow.

The second meaning is: "Teenagers are easy to get old but difficult to learn, and an inch of time is not light." This is Zhu's personal experience in warning young people. It shows that life is easy to get old and learning is difficult, so we must cherish time. Because it is easy to get old, it is not light, which shows the importance of cherishing time. These two words of upbringing sincerely advise me to cherish the beautiful years, study hard and never let precious time slip away from us in vain.