31.Observation is the best teacher.观察是最好的老师。 -

　　32.Offense is the best defense.进攻是最好的防御。-

　　33.Old friends and old wines are best.陈酒味醇，老友情深。-

　　34.Old sin makes new shame.一失足成千古恨。 -

　　35.Once a man and twice a child.一次老，两次小。 -

　　36.Once a thief, always a thief.偷盗一次，做贼一世。 -

　　37.Once bitten, twice shy.一朝被蛇咬，十年怕井绳。 -

　　38.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。-

　　39.One cannot put back the clock.时钟不能倒转。 -

　　40.One eyewitness is better than ten hearsays.百闻不如一见。 -

　　41.One false move may lose the game.一着不慎，满盘皆输。 -

　　42.One good turn deserves another.行善积德。 -

　　43.One hour today is worth two tomorrow.争分夺秒效率高。-

　　44.One man's fault is other man's lesson.前车之鉴。 -

　　45.One never loses anything by politeness.讲礼貌不吃亏。-

　　46.One swallow does not make a summer.一燕不成夏。 -

　　47.One's words reflect one's thinking.言为心声。-

　　48.Out of debt, out of danger.无债一身轻。 -

　　49.Out of office, out of danger.无官一身轻。 -

　　50.Out of sight, out of mind.眼不见，心为静。-

　　51.Patience is the best remedy.忍耐是良药。 -

　　52.Penny wise, pound foolish.贪小便宜吃大亏。 -

　　53.Plain dealing is praised more than practiced.正大光明者，说到的多，做到的少。 -

　　54.Please the eye and plague the heart.贪图一时快活，必然留下隐祸。 -

　　55.Pleasure comes through toil.苦尽甘来。 -

　　56.Pour water into a sieve.竹篮子打水一场空。 -

　　57.Practice makes perfect.熟能生巧。 -

　　58.Praise is not pudding.恭维话不能当饭吃。 -

　　59.Praise makes good men better, and bad men worse.好人越夸越好，坏人越夸越糟。 -

　　60.Prefer loss to unjust gain.宁可吃亏，不贪便宜。 -

　　61.Prevention is better than cure.预防胜于治疗。 -

　　62.Pride goes before, and shame comes after.骄傲使人落后。 -

　　63.Promise is debt.一诺千金。 -

　　64.Proverbs are the daughters of daily experience.谚语是日常经验的结晶。 -

　　65.Pull the chestnut out of fire.火中取栗。 -

　　66.Put the cart before the horse.本末倒置。 -

　　67.Put your shoulder to the wheel.鼎力相助。 -

　　68.Reading enriches the mind.开卷有益。 -

　　69.Reading is to the mind while exercise to the body.读书健脑，运动强身。-

　　70.Respect yourself, or no one else will respect you.要人尊敬，必须自重。-

　　71.Rome is not built in a day.冰冻三尺，非一日之寒。 -

　　72.Saying is one thing and doing another.言行不一。 -

　　73.Seeing is believing.眼见为实。 -

　　74.Seek the truth from facts.实事求是。 -

　　75.Send a wise man on an errand, and say nothing to him.智者当差，不用交代。-

　　76.Set a thief to catch a thief.以贼捉贼。 -