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National differences consist, far more than has hitherto been observed, only in the differences of various grades of culture, and are only to a very small extent permanent (and not even that in a strict sense).

民族差异只存在于不同文化等级的差异中，而且只在很小的程度上是永久性的(严格意义上甚至不是永久性的)。

— Friedrich Nietzsche 弗里德里希·尼采