Rumsfeld : as we know, there are known knowns, there are

Reports that say that something hasn't happened are always interesting to me, because 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.

所有跟帖： 

• 哈哈哈，你知道很多啊~~~ :) -雪晶- ♀ (0 bytes) () 03/29/2022 postreply 20:34:47

• 我就知道扯，哈哈 -kirn- ♀ (0 bytes) () 03/30/2022 postreply 06:35:39