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Nature, as we say, does nothing without some purpose; and for the purpose of making man a political animal she has endowed him alone among the animals with the power of reasoned speech.

正如我们所说，自然界没有任何事情是没有目的的;为了使人成为一种政治动物，她在动物中单独赋予他理性的语言能力。

— Aristotle 亚里士多德