What are the manifestations of the primary stage, accelerated stage, late stage and mature stage in the process of urbanization?

Internationally, the urbanization process is generally divided into three stages: the urbanization rate is below 30% in the primary stage, 30%-70% in the intermediate stage and over 70% in the advanced stage. Some people divide the process of urbanization into six stages: in prehistoric stage, the urbanization rate is below 10%; In the initial stage, the urbanization rate is10% ~ 20%; In the acceleration stage, the urbanization rate is 20% ~ 50%; In the basic realization stage, the urbanization rate is 50%-60%; At the highly developed stage, the urbanization rate is 60% ~ 80%; In the stage of self-improvement, the urbanization rate has reached more than 80%.