N-COUNT 宣讲会，座谈会(学生、教师就某一话题举行的讨论会) A teach-in is a meeting, usually between students and teachers, with discussions on important and interesting topics. Teach-ins are not usually part of a formal academic course. 宣讲会，座谈会(学生、教师就某一话题举行的讨论会)