用在开头的时候用 As everybody knows that ...接着写内容~
如果说什么事情是 众所周知 的话就用 sth is well-known ~~~~~~~~~~
It is well-known that...
As everybody knows that...
as known to all
as(is) known to all
as all know
well-known
as you know
it is well-known that
it's known to all