郑毓信教授《从张齐华老师“圆的认识”的五个教学设计谈开去》一文,勾起了我们对一节节优课的美好回忆,更启迪了我们对教师成长的深入思考。很多老师一定还记得,在2003年江苏省小学数学优课评比活动中,张齐华老师执教的《圆的认识》一课,曾惊艳全场。时至今日,张老师已经上了第5个版本的《圆的认识》。正如他本人所言:“《圆的认识》一课的几次不同演绎与重建,尤为历历在目——从历史人文视野下的丰沛厚重,到洗练纯粹 Professor Zheng Yuxin ”From Zhang Qihua teacher “ round of understanding ”five teaching design to open to go“ article, brought back a beautiful memories of a section of excellent class, but also enlighten us on the teacher’s growth in-depth thinking. Many teachers must still remember that in 2003, Jiangsu Province, primary school math excellent assessment activities, Zhang Qihua teacher coaching ”round understanding“ lesson, had a stunning audience. Today, Teacher Zhang has been on the 5th version of ”round understanding.“ As he himself said: ”Several different interpretations and reconstruction of the Lesson on Understanding of the Circle are especially vivid - from the richness of historical humanities to the pure