城市空间扩展是城市地理学、城市规划学的核心内容之一。

Urban spatial expansion is one of the core research fields in urban geography science and urban planning science.

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对城市空间的扩展，采用区域扩散的思想，提出一种城市空间扩展的放射线预测方法，并以济南为例进行了研究。

To prediction of city spatial expansion, this part brings forward predicting method of point sources radiation diffusion based on the thought of regional diffusion and takes Jinan as an example.

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对于世界上许多城市来说，已经没有进一步扩展的空间了，纽约就是其中的一个例子。

For many cities in the world, there is no room to spread out further, among which New York is an example.

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