Is there a difference between the main city and the urban management circle?

Urban area refers to the urban agglomeration area with prosperous business and dense population.

Take Changzhou as an example. Changzhou includes Changzhou, Wujin Hutang, Jintan and liyang city.

The main urban area of Changzhou refers to the urban area of Changzhou, including Tianning, Bell Tower, Xinbei and other areas.

Others, such as Hutang, are the urban areas of Wujin District, as well as the urban areas of Jintan and Liyang. They are only the urban areas of the county, not the main urban areas of Changzhou.