As Rumsfeld said, as we know, there are known knowns,

来源: Bali 于 2020-03-13 13:56:21 [] [博客] [旧帖] [给我悄悄话] 本文已被阅读： 次 (393 bytes)

As we know, there are known knowns; 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 know we don’t know. 

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• 哈哈。 绕口令啊 -awr- ♀ 给 awr 发送悄悄话 (0 bytes) () 03/13/2020 postreply 14:06:19

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