一些老师能够讲好一节课或几节课，比如领导和同事来听的课、举办的各级各类研究课、参加职称评定的课等，这些课都上得很好。但是平时上课与这些课相比，很多课是失败的，造成了课堂教学的浪费现象。 细分析一下，课堂教学种种浪费现象，主要有下面几种： 一、教学内容重复， Some teachers are able to speak well about a class or classes, such as lessons that leaders and colleagues listen to, classes of various types of studies held, and classes for the assessment of professional titles. These classes are very good. However, compared with these classes, there are many classes that fail at the same time, causing a waste of classroom teaching. To analyze in detail, there are various kinds of waste in classroom teaching. The main ones are as follows: 1. The teaching content is repeated.