Urban traffic is a complex subsystem in the whole urban social systems, and it plays a unique and important role in the evolution of cities with more and more attention.
城市交通是整个城市社会系统中的一个复杂的子系统，在城市更新演进过程中起到了独特而重要的作用，越来越受到人们的重视。
City groups are the inevitable result of natural evolution of economy and cities.
城市群体空间是经济和城市自然演化的必然结果。
The industrial evolution of central cities enjoys advantageous scale economy, preferential exterior economy and strength in structural transformation.
中心城市产业演化具有规模经济的优势、外部经济的优势和结构转换能力的优势。
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