复习是对所学知识的加深和提高。搞好复习可采取两种基本方式:按章节系统的纵向复习;还可以从一个概念或方法生发开去,把有关的知识揉合融汇起来,这可以叫做“横向复习”。这种横向复习对提高学生的综合、联想、比较、推广、发现等能力都有补益。本文就初中平面几何中垂心性质的复习,试谈一下横向复习问题,以就教于读者。 Review is to deepen and improve the knowledge you have learned. There are two basic ways to do a good job of reviewing: to review the chapters systematically in a longitudinal way, or to develop a concept or method, and to integrate the relevant knowledge. This can be called “horizontal review”. This kind of horizontal review is beneficial to students’ ability to improve their comprehensiveness, association, comparison, promotion and discovery. This article reviews the nature of verticality in the plane geometry of junior middle school and talks about the problem of horizontal review to teach the reader.