About the Authors

Yang Yu

Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing

yuyang89@dlmu.edu.cn

Affiliation School of Foreign Languages, Dalian Maritime University, Dalian, China

Yingying Xu

Roles Data curation, Formal analysis, Investigation, Supervision, Validation, Writing – review & editing

Affiliation School of Foreign Languages, Dalian Maritime University, Dalian, China

Yongkang Wu

Roles Data curation, Investigation, Software, Writing – original draft

Affiliation School of Foreign Languages, Dalian Maritime University, Dalian, China

Competing Interests

The authors have declared that no competing interests exist.