Nature is the true law.天行有常，不为尧存，不为桀亡。
Naughty boys sometimes make good men.淘气的男孩有时会成为争气的孩子。
Necessity and opportunity may make a coward valiant.需要和机会，可使懦夫变勇敢。
Necessity is the mother of invention.需要是发明的动力。
Neither fish nor flesh (nor good red herring).非驴非马；不伦不类。
Never be weary of well doing.不要厌倦做好事。
Never cast your pearls before swine.不要把珍贵之物送给不识货的人；勿明珠暗投；勿对牛弹琴。
Never challenge a fool to do wrong.不要怂恿愚人干错事。
Never deter till tomorrow that which you can do today.今日事须今日毕，切勿拖延到明天。
Never do things by halves.做事不要半途而废。
Never fish in trouble water.不要混水摸鱼。
Never judge from appearances.不可根据外貌判断；不可以貌取人。
Never put off till tomorrow what you can do today.今天能做的事绝不要拖到明天。
Never think yourself above business.勿自视过高；不要眼高手低；永远不要认为自己是大才小用。
Never too old to learn, never too late to turn.亡羊补牢，为时未晚。
Never trust another what you should do yourself.自己该做的事，决不要委托给旁人做。
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