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课本中指导观察鲫鱼呼吸的方法是：观察鲫鱼口与鳃盖的交替开闭。由于时间很短，学生不能准确观察到这种现象。我的改进做法是：将还未解剖的鲫鱼（或将其鳃盖剪除）放入解剖盘中，注入少量的水，水深以淹及口的一半即可（注意不要淹及鳃盖）。这样，当鱼口张开时，能很清楚地
The instruction in the textbook to observe the respiration of the eel is to observe the alternate opening and closing of the eel’s mouth and lid. Due to the short time, students cannot observe this phenomenon accurately. My improvement is to place the unsalted squid (or cut off its lid) into an anatomical dish and inject a small amount of water. The depth of water should be enough to cover half of the mouth (be careful not to cover the lid). In this way, when the fishmouth opens, it can be clearly seen