Years bring wisdom.

年長智也增。

Yesterday is dead, forget it; tomorrow does not exist, dont worry; today is here, use it.

昨天已經消逝，把它忘掉；明天還未來到，不必煩惱；今天就在眼前，把它用好。

Yesterday will not be called again.

光陰一去不復返。

You are the greatest enemy if you are a coward, but if you are brave, you are your greatest friend.

如果你是膽小鬼，你就是自己最大的敵人；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.

鐵熱時，你能做的不止是錘打，而錘打可使鐵熱。

You can fool some of the people all the time, and all of the people some of the time; but you cant fool all of the people all the time.

你可以一直愚弄一些人，甚至可以在某個時期愚弄所有的人；但不能一直愚弄所有的人。

You cannot clap with one hand.

孤掌難鳴。

You cannot have two forenoons in the same day.

一日之中不可能有兩個上午。

You cannot flay the same ox twice.

一頭牛不能剝兩次皮。

You cannot judge a tree by its bark.

人不可貌相。

You cannot make a crab walk straight.

江山易改，本性難移。

You (or One) cannot make a silk purse out of a sows ear.

粗瓷碗雕不出細花來。

You cannot sell the cow and sup the milk.

你不可能出售乳牛，同時又要喝牛奶。