First of all, it's this teacher. He speaks very fast in class, and I can't hear it clearly. Moreover, the purpose of my class is to communicate with foreigners and let me understand. But I couldn't even hear the basics clearly, and in the middle of the class, the teacher's picture suddenly became blurry and there was no sound, and then the teacher didn't receive anything I said. This is the only thing that can be considered, and I haven't even finished it. I am very dissatisfied with this.