Many candidates are very resistant to the defense link, because it is very difficult to control and these questions are not fixed. We can analyze the questions into structural aspects, personal information, thinking quality, educational practice and other major directions, but the answers will not be too limited, and we don't have to recall the feeling of structured interviews. Moreover, most of the defense links put forward by the examiner are aimed at the questions or unclear parts of the candidates during the trial or lecture. The common question is "Hello, this candidate, can you elaborate on the key points and difficulties in the trial or lecture?" At this time, in fact, it is usually telling us that "this candidate, the focus and difficulty of your trial or lecture are not outstanding, and I will give you another chance to remedy it." Therefore, first of all, we should humbly reply to the examiner's query about our trial lecture or lecture: "I'm sorry, examiners, maybe it's because I'm too nervous to highlight the key points and difficulties of my trial lecture or lecture, so please allow me to reiterate the key points and difficulties of my teaching. The key point of my teaching is ... the difficulty lies in ..." This is our best answer, and I hope all candidates can make good use of this skill. Please make your own mistakes.