One sin opens the door for another. ---German
犯了一次罪恶就会犯另一次罪。

One man"s meat is another man"s poison.
萝卜青菜，各有所爱。

We never know the worth of water till the well is dry.
井干方知水珍贵

Less is more.
简单就是美　

A blessing¹ in disguise.
因祸得福

Love me, love my dog.
爱屋及乌

Every dog has his day.
凡人皆有得意日　

Sharpening your axe² will not delay your job of cutting wood.    
磨刀不误砍柴功。     　

Seeing is believing.
眼见为实   

Well begun is half done.
好的开端是成功的一半

Time flies never to be recalled.
光阴一去不复返　 　

When in Rome, do as Roman do.
入乡随俗

He laughs best who laughs last.
谁笑到最后谁笑得最美

Deal with a man as he deals with you.
    以其人之道还治其人之身

Look before you leap.
三思而后行

Two heads are better than one.
    三个臭皮匠顶一个诸葛亮。

A good beginning makes a good ending.
    善始善终

A friend in need is a friend indeed.
    患难中的朋友才是真正的朋友。

First come, first served.
    先来先招待。

Where there is s will，there is a way.
    有志者事竟成。

No pains，no gains.
不劳则无获