1. School of Humanities, Beijing University of Posts and Telecommunications, Beijing, China
2. Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia, School of Computer Science (National Pilot School of Software Engineering), Beijing University of Posts and Telecommunications, Beijing, China
3. School of Communication, Shenzhen Polytechnic University, Shenzhen, China
4. College of Foreign Languages and Literature, Fudan University, Shanghai, China