Nothing in the world is difficult for one who sets his mind to it.
世上无难事，只怕有心人。

Nothing is difficult to the man who will try.
世上无难事，只要肯登攀。

Nothing is so necessary for travelers as languages.
外出旅行，语言最要紧。

Nothing is to be got without pains but poverty.
世上唯有贫穷可以不劳而获。

Nothing seek
nothing find.
没有追求就没有收获。

Nothing seek, nothing find.
无所求则无所获。

Obedience is the first duty of a soldier.
军人以服从命令为天职。

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

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

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

Old sin makes new shame.
一失足成千古恨。

On earth there is nothing great but man; in the man there is nothing great but mind. ( A. Hamilton )
地球上唯一伟大的是人，人身上唯一伟大的是心灵。（哈密尔顿）

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

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

Once bitten
twice shy.
一朝被蛇咬，十年怕井绳。

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。

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

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

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

One good turn deserves another.
行善积德。

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

One man’s fault is other man’s lesson.
前车之鉴。

One may overcome a thousand men in battle but he who conquers himself
is the greatest victor. ( Nehru )
一个人能在战场上制胜千军，但只有战胜自己才是最伟大的胜利者。（尼赫鲁）

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

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

One thing I know: The only ones among you who will be really happy are those who will have sought and found how to serve. (A. Schweizer)
有一点我是知道的：在你们之中，只有那些愿意寻求发现如何为别人服务的人，才是真正幸福的。（施韦策）

One’s words reflect one’s thinking.
言为心声。

Only those who have the patience to do simple things perfectly ever acquire the skill to do difficult things easily.
只有有耐心圆满完成简单工作的人，才能够轻而易举地完成困难的事。

Optimist: A man who gets treed by a lion but enjoys the scenery. (W.
Winchell)
乐观主义者：被狮子逼上了树但仍能欣赏风景的人。（温切尔）

Ordinary people merely think how they shall spend their time;a man of talent tries to use it.
普通人只想到如何度过时间，有才能的人设法利用时间。

Other man live to eat, while I eat to live. (Socrates)
别人为食而生存，我为生存而食。（苏格拉底）