friends. According to the official account information of Qi Lin WeChat in the public examination, Qi Lin is a professional basketball player in China and plays for the Flying Tiger Club in Guanghui, Xinjiang, CBA. Teacher Xiaodong is an excellent math teacher in Shenyang No.2 Middle School. His educational philosophy and level have been highly recognized and praised by students and parents. In the course of supporting WeChat Q&A group to answer questions for classmates, they are friends of each other.