Wuhan urban circle 武汉城市圈
urban circle layer 城市圈层
Nanjing Urban Circle 南京都市圈
shanghai urban circle 上海都市圈
urban circle in chongqing 重庆都市圈体系
structure of urban circle 都市圈构建
Urban Economic Circle 城市经济圈
urban green circle 城市绿圈
Urban tourism circle 都市旅游圈
The urban circle is the necessary stage and the more advanced form of city development. The urban circles in the middle region of China can support the rising of central China strategy on the space.
都市圈是城市发展的必经阶段和更高的表现形式,中部城市群的发育为我国中部崛起提供了空间支撑。
参考来源 - 武汉城市圈协调发展研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Wuhan city circle could be divided into three categories according to the type of urban land. The results showed that they have suffered different degrees of convergence.
将武汉城市圈按照土地类型分为三类城市，收敛性分析发现它们均出现了不同程度的收敛，而且收敛于较高的碳排放水平。
Thirdly, summarize four expressing forms of urban time structure of which isotime curve, isotime circle, time contour and time network.
时间结构的表达则从时间结构的形态方面总结出等时线、等时圈、时间廓线图和网络图等表达形式；
The author appeals to the planning circle to pay more attention to the stage of the subject planning in order to perfect the system of the urban planning.
最后，作者呼吁规划界同仁重视城市专项规划这一环节，为完善规划体系做出贡献。
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