Sun H. RESEARCH ON THE IMPROVEMENT OF CORE QUALITY OF "DOUBLE-QUALIFIED" TEACHERS IN VOCATIONAL COLLEGES UNDER THE BACKGROUND OF NEW ERA . J. E-L. Edu. Tech. [Internet]. 2023 Sep. 11 [cited 2025 Apr. 29];9(3):1-8. Available from: https://zapjournals.com/Journals/index.php/jeet/article/view/1511