What do the red team and blue team of China men's basketball team mean?

It turned out that only one national men's basketball team represented China in the Olympic Games, Asian Games and World Championships. When Yao Ming was the president of the Basketball Association, he proposed to form two national teams and divide the original national team into two, so that more powerful players can be selected to play for the country and improve the combat effectiveness of the national team. The red team includes Ding Yanyuhang, Wang Zhelin and Zhao Jiwei, and the coach is Li Nan. The blue team consists of Yi Jianlian and Guo He, and the head coach is Du Feng.