比较是一种重要的思维方法．事物与事物之间，只有通过比较，有能得出它们之间的区别和联系．对两个似乎不相关的事物，通过比较能异中求同；对外表相关的事物，通过比较又能同中求异．比较法也是处理物理问题的一种简捷方法，常常可以达到事半功倍的效果．现用下面例题加以说 Comparison is an important way of thinking. Between things and things, only through comparison, there can be drawn the differences and relations between them. For two seemingly irrelevant things, we can seek similarities by comparing differences; looking at things related to externalities, we can find differences by comparing them. Comparison method is also a simple method to deal with physical problems, and often can achieve a multiplier effect. Now use the following example to say