〔编者按〕对学科内容的研究是学科教学的基础,把研究的成果恰当地应用到课堂又是另一番功夫了。徐杲老师的文章给了我们一个范例,他在研究基础上运用教学的恰当手段,充分调动学生积极参与,课堂教学活而有序,张而有度,内容丰富且可以把握。特向老师们推荐。 [Editor’s note] The study of subject content is the basis of subject teaching. Applying the results of the research to the classroom is another work. Xu Wei’s article gives us an example. He uses the appropriate means of teaching on the basis of research, fully mobilizes students to participate actively, classroom teaching is lively and orderly, contentious, content is rich and can be grasped. Special recommendation to teachers.