Donald H. Rumsfeld said :
As we know,There are known unknowns.
There are things we know we know.
We also know There are known unknowns.
That is to say We know there are some things We do not know.
But there are also unknown unknowns,The ones we don't knowWe don't know.
As we know,There are known unknowns.
There are things we know we know.
We also know There are known unknowns.
That is to say We know there are some things We do not know.
But there are also unknown unknowns,The ones we don't knowWe don't know.
標籤： 名言錦句
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