1. Doctoral candidate, School of Economics and Trade, Guangdong Univ. of Foreign Studies, Guangzhou 510006, Guangdong, China.
2. Assistant research fellow, School of Humanities and Communication, Zhejiang Univ. of Finance & Economics, Hangzhou 310018, China; School of Economics and Trade, Guangdong Univ. of Foreign Studies, Guangzhou 510006, Guangdong, China (corresponding author).
3. Professor, School of Economics and Trade, Guangdong Univ. of Foreign Studies, Guangzhou 510006, Guangdong, China.