Never fish in trouble water.
不要混水摸鱼。

Never judge from appearances.
不可以貌取人。

Never leave that until tomorrow
which you can do today.
今天的事不要拖到明天。

Never say die.
永不言败。

Never too old to learn
never too late to turn.
亡羊补牢，为时未晚。

New wine in old bottles.
旧瓶装新酒。

No country
however rich
can afford the waste of its human resources.
任何一个国家，不管它多么富裕，都浪费不起人力资源。

No cross no crown.
不经历风雨，怎么见彩虹。

No garden without its weeds.
没有不长草的园子。

No living man all things can.
世上没有万事通。

No man can do two things at once.
一心不可二用。

No man is born wise or learned.
没有生而知之者。

No man is content.
人心不足蛇吞象。

No man is useless in this world who lightens the burden of someone else.
(C. Dickens)
在这个世界上能为别人减轻负担的人都是有用的。（狄更斯）

No man is wise at all times.
聪明一世，糊涂一时。

No news is good news.
没有消息就是好消息。

No one can call back yesterday.
昨日不会重现。
No pains
no gains.
没有付出就没有收获。

No pleasure without pain.
没有苦就没有乐。

No road of flowers lead to glory.
没有一条通向光荣的道路是铺满鲜花的。

No rose without a thorn.
没有不带刺的玫瑰。

No smoke without fire.
无风不起浪。

No sweet without sweat.
先苦后甜。

No way is impossible to courage.
勇者无惧。

None are so blind as those who won’t see.
视而不见。

None are so deaf as those who won’t hear.
充耳不闻。

None is of freedom or of life deserving unless he daily conquers it, anew.(Erasmus)
只有每天再度战胜生活并夺取自由的人，才配享受生活或自由。（伊拉斯漠）

Not to advance is to go back.
不进则退。

Not to know what happened before one was born is always to be a child.
不懂世故，幼稚可笑。

Nothing brave
nothing have.
不入虎穴，焉得虎子。

Nothing dries sooner than a tear.
眼泪干得最快。

Nothing in life is to be feared. It is only to be understood. (Marie Curie)
生活中没有什么可怕的东西，只有需要理解的东西。（居里夫人）