Centralization, Sub urbanization, Counter urbanization and Re urbanization are the main phases in the life cycle of metropolis.

向心城市化、城郊化、逆城市化和再城市化四个连续的变质阶段构成大都市的生命周期。

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With the rapid development of China's urbanization there are a series of inevitable urgent practical problems to be solved, which cause a sub-health status of China's urbanization.

在快速城市化进程中不可避免地出现了一系列亟待解决的现实问题，这使得中国的城市化整体处在亚健康状态。

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With the rapid development of China's urbanization there are a series of inevitable urgent practical problems to be solved, which cause a sub-health status of China's urbanization.

在快速城市化进程中不可避免地出现了一系列亟待解决的现实问题，这使得中国的城市化整体处在亚健康状态。

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