美国一学者的研究表明:当人们学习时,他们大约记住阅读的10%,听到的20%,看见的30%,说的70%,做的90%。因此,我们有必要改革课堂教学,减少讲与听,增加说和做。立体几何知识逻辑性强,学生往往抓不住概念、公理、定理的本质属性,不习惯对这些知识进行严格的表述,即使明白意思,也写不出来。学生如果能清晰地叙述出一道题,那么书写就不存在较大的问题,同时也说明了学生已经明确这道题的解题思路,只需 A study by American researchers shows that when people study, they remember about 10% of reading, 20% of hearing, 30% of seeing, 70% speaking, and 90% doing. Therefore, we need to reform the classroom teaching, reduce speaking and listening, increase speaking and doing. Three-dimensional geometry of knowledge logic, students are often unable to grasp the concept of axioms, the essence of the nature of the theorem, not accustomed to the strict expression of these knowledge, even understand the meaning, can not write. If students can clearly describe a problem, then writing there is no big problem, but also shows that students have clear the problem-solving ideas, just