There are three female members of a dance team, Wang Hong, Zhang Jing and Gao Wei  They are good friends from different provinces, or from Gansu, Shandong or Guangxi  Gao Wei met Zhang Jing's older sister, whose ballroom dancing was better than that of the team members from Guangxi
The team member from Shandong is an only child, and herballroom dancing is the worst of the three
Zhang Jing is from Guangxi and Gao Wei is from Gansu.