在很多国家，城市规模都遵循一个显著的正规模式，即所谓的位序-规模法则。

In many countries, city sizes follow a remarkably regular pattern, known as the rank-size rule.

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其城市遵守位序-规模法则吗？

Do its cities obey the rank-size rule?

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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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