[主持人按:本期我们特意重刊了两篇名家的旧作:一篇是心理学上一个重要学派的主要奠基人,德国著名心理学家韦特海默50多年前的一本名作的一个选段(大多数老师不曾见到过吧!);一篇是国内中学数学教师中数一数二的姣姣者马明先生6年多前的一篇论文的一个名例,两篇作品的一个共同特点 [Moderator press: In this issue, we deliberately republished two famous works: One is the main founder of an important school of psychology, one of the masterpieces of a famous German psychologist Wertheimer more than 50 years ago. Selected passages (most teachers have never seen it before!); One is a famous example of Mr. Ma Ming, one of the best middle school mathematics teachers in China, and a common example of a thesis more than six years ago.