About the Authors

Wei Wang

Roles Data curation, Formal analysis, Methodology, Writing – original draft

Affiliation Department of Applied Foreign Language Studies, Nanjing University, Nanjing, China

Haixiao Wang

Roles Supervision, Writing – review & editing

hxwang@nju.edu.cn

Affiliation Department of Applied Foreign Language Studies, Nanjing University, Nanjing, China

Competing Interests

The authors have declared that no competing interests exist.