1. Collaborative Innovation Center of South China Sea Studies, Nanjing 210093, China
2. School of Geographic & Oceanographic Sciences, Nanjing University, Nanjing 210023, China
3. Institute of African Studies, Nanjing University, Nanjing 210023, China
4. Johns Hopkins University-Nanjing University Center for Chinese and American Studies, Nanjing 210093, China
5. Department of Architecture and Built Environment, University of Nottingham, Ningbo 315100, China