通过对高中《生物》乙种本（图3）、高中《生物》甲种本（图4）与现行高中《生物》必修本（图5）的对比,可看出以下一些问题: 1.现行课本已改正了原甲、乙两种版本对细胞壁位置的标注（即图中2的标注）。笔者认为,对此标注还应作进一步的理解。这就是,图中“2”所指的包括相邻两细胞的两层 By comparing high school “biology” B type (Figure 3), high school “biology” type A (figure 4) and current high school “biology” required revision (figure 5), we can see the following problems: 1. Current The textbook has corrected the annotation of the cell wall position in the original versions A and B (namely, the label 2). The author believes that this annotation should be further understood. That is, the “2” in the figure includes two layers including two adjacent cells.