raise doubts and difficult questions for discussion ? 在學習中，學生們～，坦率交換意見。In their studies the students raise doubts and difficult questions for discussion and exchange their views frankly.
質(zhì)疑問難zhì yí wèn nàn
質(zhì)：詢問；難：詰責。提出疑難問題，請人解答或相互討論、辯論。raise doubts and difficult questions for discussion, ask questions for arguing