Audio-visual course, the professional name is electronic teaching course, and the relatively high-end teaching method is to use computers and their connected projectors for teaching.
Lesson examples, that is, classroom teaching records or classroom teaching documentaries, are practical styles that truly record the whole process of teachers' classroom teaching. The author listened to an excellent teacher's observation class and felt deeply after listening. He thinks that this course embodies certain educational and teaching ideas and is worth summarizing and popularizing.