不知之不知 There are known knowns
（重定向自Unimaginability）
「不知之不知」（英语：Unknown unknown）是前美国国防部长拉姆斯菲尔德在2002年2月回应记者提问时的名言。
Unimaginability
中文百科
英语百科
There are known knowns 不知之不知
（重定向自Unimaginability）
"There are known knowns" is a phrase from a response United States Secretary of Defense Donald Rumsfeld gave to a question at a U.S. Department of Defense (DoD) news briefing on February 12, 2002 about the lack of evidence linking the government of Iraq with the supply of weapons of mass destruction to terrorist groups.
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