1.The water that bears the boat is the same that swallows it up.
水能载舟，亦能覆舟。
2.Old sin makes new shame.
一失足成千古恨。
3.Once bitten， twice shy.
一朝被蛇咬，十年怕井绳。
4.One boy is a boy， two boys half a boy， three boys no boy.
一个和尚挑水喝，两个和尚抬水喝，三个和尚没水喝。
5.Wet behind the ears.
乳臭未干。
6.One eyewitness is better than ten hearsays.
百闻不如一见。
7.One man's fault is other man's lesson.
前车之鉴。
8.Out of sight， out of mind.
眼不见，心为静。
9.Pleasure comes through toil.
苦尽甘来。
10.Pour water into a sieve.
竹篮子打水一场空。
11.Practice makes perfect.
熟能生巧
12.Pride goes before， and shame comes after.
骄傲使人落后。
13.Promise is debt.
一诺千金。
14.Rome is not built in a day.
冰冻三尺，非一日之寒。
15.Seek the truth from facts.
实事求是。