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。
Kings go mad, and the people suffer for it君王发狂，百姓遭殃。
Kings have long arms.普天之下，莫非王土。
Knowledge is power.知识就是力量。
No pleasure without pain.没有苦就没有乐。
No rose without a thorn.没有不带刺的玫瑰。
Nothing dries sooner than a tear.眼泪干得最快。
Nothing in the world is difficult for one who sets his mind to it.世上无难事，只怕有心人。
Not to know what happened before one was born is always to be a child.不懂世故，幼稚可笑。
No way is impossible to courage.勇者无惧。
Obedience is the first duty of a soldier军人以服从命令为天职。
It is the first step that costs troublesome.万事开头难。
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