尽管物理习题情境不断翻新,所用到的材料也在交替变更,但本质上大都离不开原有的经典模型.一些学生觉得物理题难解,其中很重要的一个原因就是不能把问题转化成自己所熟悉的物理模型,思维往往集中在问题的表象上,对陌生的物理模型不能辨异识同.把貌离神合的新模型与典型模型进行比较,从而发现新、旧模型在物理本质上的共性,是同学们需要培养的一项技能. Although the physics and practice situation has been continuously refurbished, the materials used have also been changed. However, most of them are inseparable from the original classic models. Some students think that physical problems are difficult to understand. One of the important reasons is that they cannot turn problems into themselves. In the familiar physical model, the thinking is often focused on the appearance of the problem. The strange physical model cannot be identified and compared. The new model is compared with the typical model to discover the physical nature of the new and old models. The commonality is a skill that the students need to cultivate.