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工作学习 / English / Donald Rumsfeld 的绕口令。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.
- Donald Rumsfeld, February 12, 2002
-canadiantire(轮胎-M.I.N.K.);
2006-1-26
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thanks for sharing..
-fatbean(Doodling....);
2006-1-26
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