About the Authors

Yuan Zhang

Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Supervision, Writing – original draft, Writing – review & editing

cassie0848@sina.com

Affiliation School of Foreign Languages, Shandong Normal University, Ji’nan, Shandong Province, China

Zewen Wang

Roles Conceptualization, Data curation, Formal analysis, Methodology, Resources, Software, Visualization, Writing – original draft, Writing – review & editing

Affiliation School of Foreign Languages, Shandong Normal University, Ji’nan, Shandong Province, China

Competing Interests

The authors have declared that no competing interests exist.