A: The defense time for master students in the Second Xiangya Hospital of Central South University is generally 2-3 weeks before graduation, and the specific time is arranged by the hospital. Before the defense, students need to prepare the defense PPT and related materials, and at the same time, they need to be fully prepared and trained. When replying, students need to reply according to the specified time and answer the examiner's questions. In the process of defense, students should pay attention to mastering language expression and time allocation in order to fully display their research results and ideas. In some cases, if the result of defense is not satisfactory, students can make up the exam by defense.