To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.

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To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.

知道我们知道我们所知道的,知道我们不知道我们所不知道的,这就是真正的知识。

-- Nicolaus Copernicus 哥白尼

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