“体积”是一个较为抽象的概念。在构建这一概念时,教师往往先从乌鸦喝水的故事引入,通过排水实验(通常由老师代替或课件演示),让学生知道物体占据空间;再让学生通过比较知道物体所占空间是有大小的,从而揭示体积概念。这样的教学,忽略了学生体积概念形成的过程,空间观念的发展也没有落实到实处。基于此,我对本节课进行了重构。 “Volume ” is a more abstract concept. When constructing this concept, teachers often start with the story of a crow drinking water and let the students know the space occupied by the object through a drainage experiment (usually replaced by a teacher or a courseware); letting the students know the space occupied by the object by comparison Size, thus revealing the concept of volume. This teaching, ignoring the formation of the concept of student volume process, the development of space concept has not been implemented. Based on this, I have refactored this lesson.