凡事总是由难而易。

all things are difficult before they are easy.

all work and no play makes jack a dull boy.

只会用功不玩耍，聪明孩子也变傻。

a man becomes learned by asking questions.

不耻下问才能有学问。

a man can do no more than he can.

凡事都应量力而行。

a man cannot spin and reel at the same time.

一心不能二用。

a man is known by his friends.

什么人交什么朋友。