1. Department of Sociology, School of Humanities and Social Sciences, Xi’an Jiaotong University, Xi’an 710049, China
2. Department of Physical Education, Xidian University, Xi’an 710126, China
3. Department of Sociology, School of Public Administration, Hohai University, Nanjing 211100, China
4. Research Center for Environment and Society, Hohai University, Nanjing 211100, China