Hmm \x0d\ In the previous investigation or research, it should all be elaborated by articles, so the summary can combine all the topics, and then briefly introduce the research process, or add a few conclusions when necessary. In fact, it is similar to the structure of an article: total-total, which is to summarize the above contents. \x0d\ The research topics I have written are all about simply polishing the original conclusions (because teachers usually give several optional topics) and summarizing the previous ones. You can do an assignment ~\x0d\ for reference. _