What does the lower branch angle mean? What about Gubei area?

The "lower corner" in Shanghai dialect should be "lower corner", which refers to a relatively poor and underdeveloped place, and the antonym is "upper corner". Gubei area is a foreign-related area developed earlier in Changning District, adjacent to Hongqiao Development Zone. Many foreigners, Hong Kong and Taiwan people live here, and they are all rich. Carrefour Gubei Store, the best hypermarket in China, is located at the elevated entrance of Yan 'an West Road, Shuicheng South Road.