How to explain that online class endorsement is not called by the teacher?

Tell the teacher that you like reading silently. The best way to endorse varies from person to person. Just because some people like talking loudly and some people like reading silently doesn't mean that opening your mouth will be more efficient. The key to endorsement is that you may be in Yuzuru Hanyu or not in Yuzuru Hanyu, but you can listen to your own ears and listen attentively, which is efficient, otherwise even the voices heard by the whole world will not be heard by you, and it will have no effect. Therefore, to endorse, it is necessary to achieve the unity of heart and heart, and the eyes and heart can see it. As for whether there is sound, it doesn't matter much.