现代代数中使用的十进制源于人类拥有的手指数量，在语言中也存在“five”，“finger”和“fist”的相似现象以及“digit”的双重含义都提供了这样的证据。

The base-ten system used in modern arithmetic originates with the fingers, and linguistic traces of that fact remain in the similarity of "five", "finger" and "fist", and the dual meaning of "digit".

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