Years bring wisdom.
年长智也增。
Yesterday is dead, forget it; tomorrow does not exist, don't worry; today is here, use it.
昨天已经消逝,把它忘掉;明天还未来到,不必烦恼;今天就在眼前,把它用好。
Yesterday will not be called again.
光阴一去不复返。
You are the greatest enemy if you are a coward, but if you are brave, you are your greatest friend.
如果你是胆小鬼,你就是自己最大的敌人;如果你是勇敢者,你就是自己最好的朋友。
You can do more than strike while the iron is hot; you can make the iron hot by striking.
铁热时,你能做的不止是锤打,而锤打可使铁热。
You can fool some of the people all the time, and all of the people some of the time; but you can't fool all of the people all the time.
你可以一直愚弄一些人,甚至可以在某个时期愚弄所有的人;但不能一直愚弄所有的人。
You cannot clap with one hand.
孤掌难鸣。
You cannot have two forenoons in the same day.
一日之中不可能有两个上午。
You cannot flay the same ox twice.
一头牛不能剥两次皮。
You cannot judge a tree by its bark.
人不可貌相。
You cannot make a crab walk straight.
江山易改,本性难移。
You (or One) cannot make a silk purse out of a sow's ear.
粗瓷碗雕不出细花来。
You cannot sell the cow and sup the milk.
你不可能出售乳牛,同时又要喝牛奶。