1, time is limited, money can't be bought, and status can't be maintained.

Only by making full use of time can we succeed.

3. Time can't go back.

Time passes quickly.

"Time is the material that constitutes a person's life." Franklin said this sentence to make people cherish time.

Understanding: Everyone's life is limited, and the time to belong to a person is also limited. If a person's life comes to an end, then his life time is over. It can be seen that people and time are closely related. Of all the critics in the world, the greatest, the most correct and the most talented is "time", while "the fastest, the slowest, the longest, the shortest, the most mundane, the most precious, the most easily overlooked and the most easily regretted is time."

"Time flies and makes people old, and the sun and the moon fly like teenagers." (Yuan) Gao Ming

Understanding: Fast time, chasing teenagers, urging the elderly to work hard.

"Flowers will bloom again, and people will never be young again".

Understanding: flowers can still bloom, and people can't be young when they are old. Educate people to cherish time.