根据教学大纲的要求 ,教材编写时对有些知识并不需要叙述得过细、过透 ,而是有意识地给学生留有思考的内容和空间 ,让学生阅读课本时主动进行分析思考 ,找出教材中省略的内含 ,即捕捉教材中的“弦外之音”.这样既能培养学生形成良好的学习习惯 ,又能锻炼学生独立思考问题和分析 According to the requirements of the syllabus, some of the knowledge in the compilation of teaching materials do not need to be detailed and thorough. Instead, they consciously give students the content and space for thinking. When students read textbooks, they actively analyze and think and find out the teaching materials. The inclusion of omissions means capturing the “off-string sounds” in the textbook. This will not only cultivate students’ good learning habits, but also exercise students’ independent thinking and analysis.