利用图解突破难点两例湖南省平江县第四中学（４１０４１１）欧阳浩波突破“渗透吸水的原理”难点在教学实践中，我发现学生容易掌握渗透作用和成熟的植物细胞的结构，但就是不理解“渗透吸水的原理”这一难点，为此，我充分利用图解，采用“画图—比较—总结”三步曲，很... Using diagrams to break through the difficulties Two cases of Pingjiang County No. 4 Middle School in Hunan Province (410411) Ouyang Haobo broke through the “penetration of water absorption principle” Difficulties In teaching practice, I found that students can easily grasp the structure of infiltration and mature plant cells, but it is not Understand the difficulty of “the principle of penetration and water absorption”. For this reason, I have fully used the illustrations and adopted the “draw-comparison-summary” three-step process. It is...