制约中国古代城市规模的要素是多重的，因此对于城市规模的研究不能仅仅局限于城市的行政等级。

The size of ancient Chinese cities was restricted by many factors. Hence, while studying the city size, we must not only refer to its administrative scale.

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从城市规模分布的位序-规模法则出发，推导出城市等级体系的二倍数法则。

This paper demonstrates the equivalent relation between the 2n rule of hierarchy of cities and the rank-size rule of city size distribution.

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从城市规模分布的位序-规模法则出发，推导出城市等级体系的二倍数法则。

This paper demonstrates the equivalent relation between the 2n rule of hierarchy of cities and the rank-size rule of city size distribution.

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