Nature abhors a vacuum. 自然界里无真空。
Nature is the glass reflecting truth. 大自然是反应真理的一面镜子。
Nature will have its course. 天行其道。
Nature will out. 本性难隐。
Neither cast tour pearls before swine. 不要对牛弹琴。
Never put the plow before the oxen. 不要本末倒置。
No man ever yet became great by imitation. 笑颦不能成西施。
No simile runs on all fours. 任何比喻和原物都有出入。
Old birds are not to be caught with chaff. 老谋是不会失算的。
Old proverbs are the children of truth. 古谚是真理之子。
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 generation passes away, and another generation comes. 世事沧桑，人生苦短。
One honest word is better than two oaths. 两句誓言不如一句实话。
One man, no man. 孤掌难鸣。
One thorn of experience is worth a whole wilderness of warning. 一次痛苦的经验抵得上千百次的告诫。
Other times, other manners. 俗随时变。
Nothing can come of nothing. 本来无一物，何处惹尘埃?
Not every couple is a pair. 成对不尽成双。/夫妻不尽般配。
Nothing endures but truth. 唯有真理永存。
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 a man who wills.世上无难事，只怕有心人。
Nothing is so certain as the unexpected. 天有不测风云，人有旦夕祸福。
Nurture is above(passes) nature.教育重于天赋。