四大皆空
All is vanity.

四海之内皆兄弟
All are brothers within the four seas.

四面八方
These folks come from in all directions (far and wide; there and everywhere; length and breadth)

四海为家
I don't know where Jack is now; in my mind, he is a person who is here today and gone tomorrow.

未雨绸缪
take precautions before it is too late

目不识丁
not know A from B / an illiterate

失败为成功之母
Failure is the mother of success.

失之毫厘,差之千里
A miss is as good as a mile.

只要功夫深,铁杵磨成针
Little strokes fell great oaks.

毛遂自荐
to recommend one's own person 

小Car笔记:

vanity:虚无,浮云
illiterate:文盲,目不识丁  【常用词组】①functional illiterate:职业上的文盲  ②illiterate population 未受教育的人口
recommend:推荐 【常用词组】recommend substitutes:推荐代用器

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