Lost time is never found again,
Lost wealth can be replaced by industry， lost know I edge by study, lost health by temperance or medicine, but lost time is gone for ever.
失去的财富， 靠勤劳赚回;失去的知识，靠学习复得;失去的健康，可通过节制或药物恢复;但失去的 时间，却一去永不复返。
Make the night night, and the day day, and you wiI I have a pleasant time of it,
More worship the rising than the setting sun,
No man can call again yesterday.
No one can call back yesterday,
No time (to waste) like the present.
None but a wise man can employ leisure weII.
On the great clock of time there is but one word, “Now” .
Once a cock begins to crow, it never again becomes dumb.