raise doubts and difficult questions for discussion ❍ 在学习中，学生们～，坦率交换意见。In their studies the students raise doubts and difficult questions for discussion and exchange their views frankly.
质疑问难zhì yí wèn nàn
质：询问；难：诘责。提出疑难问题，请人解答或相互讨论、辩论。raise doubts and difficult questions for discussion, ask questions for arguing