The teacher started the class with an introductory discussion on the importance of critical thinking.
老师通过引导性讨论开始了课程，讨论了批判性思维的重要性。
Students engaged in an introductory discussion to brainstorm ideas for their group project.
学生们通过引导性讨论来集思广益，为他们的团队项目提出想法。