Life is short, as everyone knows.

人生短暂，每个人都知道。

I am both brave and mad as everyone knows!

我们既大胆又愚蠢每个人都知道！

As everyone knows, smoking is very harmful.

大家都知道，吸烟非常有害。

As everyone knows, all that glitters is not gold.

众所周知，闪光的不一定都是金子。

Their judgment, as everyone knows, is not always right.

众所周知，他们的判断，并不总是正确的。