因此，大多数数字系统都是两个关键因素的意外结果：人类的语言能力及我们对手和手指的关注倾向。
Most number systems, then, are the by-product of two key factors: the human capacity for language and our inclination for focusing on our hands and fingers.
因此，大多数数字系统都是两个关键因素的意外结果：人类的语言能力及我们对手和手指的关注倾向。
Most number systems, then, are the by-product of two key factors: the human capacity for language and our inclination for focusing on our hands and fingers.
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