When writing an academic paper, it is necessary to summarize the literature and quote the existing related research. This process is called "novelty retrieval", which is intended to ensure that the author has a comprehensive understanding of the existing knowledge and frontier progress in the current field, and can compare or expand his work accordingly. In some cases, papers will be required to be exempted from novelty retrieval. It means that the author doesn't have to reread, evaluate or quote other people's research results. This requirement will appear in certain types or formats of papers (such as review articles, opinion expression, etc.). ), and is limited to specific topics.