as everyone knows;
as is known to all
It is well known that.....(主语从句,that后跟的是主语,也就是it所指的)
这三个用的比较广
as is well known ;
common knowledge;
general knowledge
to be universally known
it can be well-known that....
it is a matter of common observation that ;
it is known that ;
it is common knowledge that ;
it is learned that...
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