20 0 1年 12月 2 6日下午 ,是华东师范大学第三期国家级骨干教师培训班数学个案学习课最后一节———优秀个案交流 .有两个老师的发言引起了争论 ,从课上到课下 ,各方争论不休 .本文作者 ,作为旁听 ,也参与了他们的思考 .第一个发言交流的是湖北的宋庆福老师 ,针对他个案中谈到 On the afternoon of December 26, 2020, it was the last section of the third national key teacher training class in the East China Normal University mathematics case study class—excellent case exchanges. There were two teachers’ speeches that caused controversy, from the class After attending class, the parties debated endlessly. The author of this article, as an observer, also took part in their thinking. The first speaker who spoke and exchanged was Song Qingfu, a teacher from Hubei, who talked about his case.