the mediocre teacher tells, the good teacher explains, the superior teacher demonstrates, the great teacher inspires
US /ðə ˌmiː.diˈoʊ.kər ˈtiː.tʃər telz ðə ˌɡʊd ˈtiː.tʃər ɪkˈspleɪnz ðə səˈpɪr.i.ər ˈtiː.tʃər ˈdem.ən.streɪts ðə ˈɡreɪt ˈtiː.tʃər ɪnˈspaɪərz/

1.
平庸的老师讲述,好的老师解释,优秀的老师示范,伟大的老师启发