为了提高实验成功率，缩短实验时间．降低实验成本，我对高中教材实验二的步骤和方法做了一些改进。1．取材及装片制作时，用双手将一片洋葱鳞片叶轻轻掰开（注意：用力时朝内表皮方向），这时可发现断裂处仍有一薄层膜相连，这就是我们所需的最佳材料，然后用镊子撕取一小块薄 In order to increase the success rate of the experiment, the experiment time is shortened. To reduce the cost of the experiment, I made some improvements to the steps and methods of experiment 2 of the high school textbook. 1. When drawing and loading, use a pair of hands to gently pry a piece of onion scaly leaves (note: forcefully toward the inner surface of the epidermis). At this moment, you can find that there is still a thin film connected at the break. This is the best we need. The material is then torn off with a piece of tweezers