From the city layouts and functioning point of view, dense city theory and decentralized city theory represent two fundamental arguments in modern urban planning study.
从城市形态上来看，分散论和集中论体现了现代城市规划设计的两种基本主张。
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The second part is case studies of present situation and urban planning of China's medium or small-scale cities, aiming at finding out their roots of decentralized layout.