I also know that many students are manuscripts and newspaper articles, and the results were not detected in the school's HowNet papers. This situation does exist. Many books are not included in the database of HowNet, but the latest publications are basically included. Because the current technology can be collected and preserved.
The production of chronological books is unlikely to be included for a long time, but there is no guarantee that it will not be included, and the number of citations will increase, and the database of online papers will also be included. With the continuous upgrading and updating of the database of the paper duplicate checking system, more and more copies will be collected, the duplicate checking database will become richer and richer, and the probability of being found out will become greater and greater.
In the paper duplicate checking system of HowNet, instead of worrying about whether it will be duplicated, it is better to use other methods to reduce the repetition rate of copied content, make it have the same meaning as possible and express different sentences.