Teaching activities should be completed by both teachers and students, including interactive links such as question and answer, discussion, practice and feedback. The teaching process is a process of emotional and psychological communication between teachers and students. This kind of communication-oriented teaching is honesty teaching. Teachers' emotional lectures and eye contact arouse students' emotional singing. Therefore, the communication between teachers and students plays an unusual role in organizing teaching. However, "micro-class" only shows that teachers impart a certain knowledge or skill, that is, "micro-class" completes teaching activities through one-way "dialogue" between man and machine. So, can man-machine "dialogue" replace teacher-student communication? Take the principle of primary battery as an example to discuss this problem. This "micro-lesson" lasts for 4 minutes and 54 seconds. It introduces the topic from the application of primary battery in life, analyzes the concept and conditions of primary battery, and finally explains the working principle of primary battery. If it takes 25 to 30 minutes to complete these contents in class, why can the original 25 minutes be compressed to 5 minutes? There may be some factors that teachers fail to explain, but the main reason may be the lack of students' participation and the lack of bilateral activities and teaching feedback between teachers and students. Once the teacher is immersed in it, indoctrination teaching greatly saves time. The teaching effect here really needs a big question mark. Have the students learned? How do you know that students have learned? I think that an efficient classroom with "life" should be based on learning, and teachers' "teaching" should be based on students' "learning", so as to be targeted. A classroom with "life" needs interaction and cooperation between teachers and students, and communication and completion. However, the one-way "micro-lesson" between man and machine is missing at this point.