教学论认为:课堂教学过程是由教师、学生、教学内容和教学手段等四个要素组成的统一体,其中教学手段指的是教师给以有效地传递信息和学生接受信息的物质条件。也就是我们常说的教学媒体。教学媒体是随着社会的不断进步而不断发展的。现代社会、除了传统的教学媒体(如黑板、图片、教科书等)外,由于科学技术的腾飞,电子技术的兴起,产生了现代化的电教媒体(如投影、电视、录像、电脑等)。教学实践表明,多媒体(包括传统媒体和电教媒体)进入课堂教学,在教 The teaching theory holds that the classroom teaching process is a unity of teachers, students, teaching contents, and teaching methods. The teaching means refers to the material conditions that teachers give to effectively transmit information and students accept information. That is, we often say teaching media. The teaching media is continuously developing along with the continuous progress of society. In modern society, in addition to traditional teaching media (such as blackboards, pictures, textbooks, etc.), thanks to the rapid development of science and technology and the rise of electronic technology, modern audio-visual media (such as projection, television, video, and computers) have been produced. Teaching practice shows that multimedia (including traditional media and audio-visual media) enters classroom teaching and teaches