With the growing urban population, the increasing size of cities, cities have become increasingly heavy traffic loads, cities can use the public space is increasingly small.

随着城市人口的不断增长，城市规模的不断扩大，城市的交通负荷变得越来越重，城市中可以利用的公共空间也越来越少。

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We start at the rank-size rule by urban population and the rank-size rule by urban built-up area, and derive a mathematical relationship that the land use size of a city and its population.

从前人的成果，即以人口表示的城市位序-规模法则和以建成区面积表示的位序-规模法则出发，演绎出城市的用地规模和人口数量呈异速增长。

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With the rapid expansion of city size and population concentration, improving the urban disaster prevention system has become a daunting task can not be ignored.

健全城市防灾系统成为一项不容忽视的艰巨任务，这是由城市规模的急速扩大和人口的过度集中所造成的。

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