世界上有已知的已知，也有未知的未知，还有已知的未知，更有未知的已知……
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美国国防部长唐纳德·拉姆斯菲尔德的“已知未知”名言：“我对那些声称某些事情尚未发生的报道总是很感兴趣，因为如我们所知，有已知的已知，有些东西我们知道自己知道。我们也知道，有已知的未知，就是说我们知道有某些东西我们并不知道。同时还有未知的未知——就是说我们不知道自己不知道。”
（"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."）
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美国国防部长唐纳德·拉姆斯菲尔德的“已知未知”名言：“我对那些声称某些事情尚未发生的报道总是很感兴趣，因为如我们所知，有已知的已知，有些东西我们知道自己知道。我们也知道，有已知的未知，就是说我们知道有某些东西我们并不知道。同时还有未知的未知——就是说我们不知道自己不知道。”
（"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."）
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