俗话说“凡事预则立,不预则废”,教师对所教内容预先做出设计是教学的基本要求。但是,课堂上总有许多不确定因素,对于那些脱离教学预设的“节外生枝”,有的教师要么不知所措束之高阁,要么蜻蜓点水一语带过。这样的课堂看起来完整有序,却很难唤起学生学习的活力与创造力。殊不知 As the saying goes, “Everything is presupposed, it is not presupposed to be abolished”, and teachers’ preliminary design of the content taught is the basic requirement for teaching. However, there are always a lot of uncertainties in the class. For those “outside the knot” that fall outside the teaching presupposition, some teachers are either ignorant of the facts or are ignorant of the words. Such a classroom seems to be complete and orderly, but it is difficult to evoke the vitality and creativity of student learning. I do not know