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送交者: Latino2 于 2007-11-16, 11:07:27:

回答: thre might be someone who doesn't know, but he knows someone else knows it 由 Wood 于 2007-11-16, 10:58:54:

引用：
....there are things we know we know, there are things we know we don't know. But there are also unknown unknowns -- the ones we don't know we don't know.......




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