1 the water that bears the boat is the same that swallows it up
水能载舟亦能覆舟
2 Observation is the best teacher
观察是最好的老师
3 Offense is the best defend
进攻是最好的防御
4 Old friends and Old wines are best
陈酒味醇，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，两次小
7 Once a thief .always a thief
偷盗一次，做贼一世
8 Once bitten ，twice shy
一朝被蛇咬十年怕井绳
9 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
10 Wet behind the ears
乳臭未干
11 One eyewitness is better than ten hearsays
百闻不如一见
12 One false move may lose the game
一着不慎满盘皆输
13 One good tur deserves another
行善积德
14 One hour today is worth two tomorrow
争分夺秒效率高
15 One man’s fault is other man’s lesson
前车之鉴
16 One never loses anything by politeness
讲礼貌不吃亏
17 One swallow dose not make a summer
一蒸不成夏
18 One’s words reflect one’s thinking
言为心声
19 Out of debt, Out of danger
无债一身轻
20 One cannot put back the clock
时钟不能倒转