didactic
adjective uk/daɪˈdæk.tɪk/ us/daɪˈdæk.t̬ɪk/
mainly disapproving教训的，说教的
intended to teach, especially in a way that is too determined or eager, and often fixed and unwilling to change
a didactic approach to teaching 说教式的教学方法
道德说教的
intended to teach people a moral lesson
didactic literature 道德说教文学