When defending a thesis, the questions asked by the teacher will focus on the background technology of your thesis and the research you have done. If you are a graduate student, it takes about 10-30 minutes, and if you are an undergraduate student, it takes about 3- 10 minutes. Of course, this is related to the specific teacher. If you understand or learn in the process of exception defense, explain clearly, if you don't understand, say you don't understand, and if you don't consider this question, objectively say that you really haven't considered it. This is what we will do next.