1.Once bitten， twice shy.一朝被蛇咬，十年怕井繩。

2.One boy is a boy， two boys half a boy， three boys no boy.一個和尚挑水喝，兩個和尚抬水喝，三個和尚沒水喝。Observation is the best teacher.觀察是最好的老師。

3.Offense is the best defense.進攻是最好的防御。

4.Old friends and old wines are best.陳酒味醇，老友情深。

5.Old sin makes new shame.一失足成千古恨。

6.Once a man and twice a child.一次老，兩次小。

7.Once a thief， always a thief.偷盜一次，做賊一世。

8.The water that bears the boat is the same that swallows it up.水能載舟，亦能覆舟。

9.Observation is the best teacher.觀察是最好的老師。

10.Wet behind the ears.乳臭未干。

11.One cannot put back the clock.時鐘不能倒轉。

12.One eyewitness is better than ten hearsays.百聞不如一見。

13.One false move may lose the game.一著不慎，滿盤皆輸。

14.One good turn deserves another.行善積德。

15.One hour today is worth two tomorrow.爭分奪秒效率高。

16.One man‘s fault is other man’s lesson.前車之鑒。

17.Time and tide wait for no man.歲月無情;歲月易逝;歲月不待人。

18.Time tries all.時間檢驗一切。

19.Time tries truth.時間檢驗真理。

20.Time past cannot be called back again.光陰一去不復返。