敬请仔细体会：知之为知之不知为不知是知也

来源: 瞎问瞎说于 2014-04-13 11:47:20 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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敬请仔细体会：知之为知之 不知为不知 是知也