我的老师——北京师范大学朱鼎勋教授已去世半年多了.朱先生毕生从事数学教育工作,倾全部心血培育年轻一代,他的照人风采,音容笑貌,严谨的治学精神,永远留在我们的记忆中. 我上大学一年级时,有幸亲聆朱先生的解析几何课.先生时当中年,精力充沛,热情奔放,边讲边打着手势,不停地在讲台上走来走去,有时还走下讲台来到学生中间.讲到重点的地方,他总是用力板书,加重语气,给同学们留下了深刻的印象.虽时隔多年,但回想起来,当时先生的形象仍历历在目. My teacher, Professor Zhu Dingxun of Beijing Normal University, has died more than half a year ago. Mr. Zhu devoted his entire life to mathematics education and devoted all his efforts to nurture the younger generation. His demeanor, grace and vigor, rigorous scholarship spirit will always remain in us. In memory, when I was in the first year of college, I was fortunate to hear Mr. Zhu’s analytic geometry lesson. When he was a middle-aged man, he was energetic and enthusiastic. He gestured while speaking and kept walking around the podium. Sometimes, He also walked off the podium and came to the middle of the students. When he talked about the key points, he always tried to write a book, adding to his tone, and left a deep impression on the students. Although many years later, in retrospect, the image of Mr. Head.