水分代谢中渗透吸水的原理,是细胞吸收水分、植物细胞的质壁分离和复原、矿质代谢等教学内容的理论基础,也是教学中的重点和难点。我用卵壳膜作为半透膜进行渗透吸水原理的实验获得成功,从而突破这一难点。 The principle of osmotic water absorption in water metabolism is the theoretical basis of the teaching contents such as the cell absorption of water, the separation and restoration of the plasmolysis of plant cells, and mineral metabolism, and is also the key and difficult point in teaching. I use the egg shell membrane as a semi-permeable membrane to penetrate the principle of water absorption experiment was successful, thus breaking this difficult.