A lazy youth, a lousy age.
Teenagers only know how to play, but don't know how to study hard. When they are old, they regret why they didn't know how to study hard when they were young.
Flowers will reopen one day, and life is no longer a teenager.
Without two mornings a day, time will not come.
Time flies, the sun and the moon fly like a shuttle.
When night comes, no one can keep a corner of the sun.
Time is a silent file.
Mediocre people are too lazy to kill time, and capable people try their best to make use of it.
When flowers can be folded, they must be folded straight. Don't wait until there are no flowers.