The defense only has two arguments. If the second debate fails, the defense will be postponed for one year and only a diploma will be issued. You can't get a degree certificate until you pass the defense. In addition, the passing rate of undergraduate graduation thesis is very high, because for undergraduates, as long as they write a thesis of 5000~8000 words, as long as the duplicate checking rate is less than 30%, they can basically pass. The requirements for quality instructors or thesis judges will not be too high.