某先生名语：“There are known knowns. These are things we know that we

来源: 数字证 于 2014-11-03 15:42:19 [] [旧帖] [给我悄悄话] 阅读数 : (290 bytes)
回答: 真理总是被某些人诽谤成胡说 由 abookl 于 2014-11-03 11:59:27

There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know.

Donald Rumsfeld

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