但由于城市行政界限的频繁变动和一些城市无限制地扩大市区行政面积 ，使城市人口和城市化水平的统计数字失真。

This paper brings forward the method of dividing a city into different circle layers, make certain the property of each layer, to make sure the urban population and urbanization level.

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抵押品赎回危机的全面开始和人口统计的变动、高油价和一系列其他因素意味着郊区可能正在慢慢消失。

The full onset of the mortgage foreclosure crisis, coupled with demographic changes, rising fuel prices and a host of other factors means that the suburbs could be on the way out.

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