First of all, paper duplication checking is to compare the text of the paper with the existing literature database to detect whether there are plagiarism, plagiarism and other improper behaviors in the paper. HowNet is a large-scale academic literature database, which contains a large number of documents and covers a wide range, including academic journals and conference papers at home and abroad. Therefore, in principle, HowNet should be able to detect plagiarism.

However, the duplicate checking rate of HowNet papers is 0% for the following reasons. First of all, it may be because there are some technical problems in the duplicate checking system of HowNet. Although the duplicate checking system of HowNet should have high accuracy and sensitivity, there may still be some loopholes and misjudgments. For example, some plagiarism may be missed by the system or misjudged as non-plagiarism, resulting in a duplicate checking rate of 0%.

Secondly, individual students may intentionally or unintentionally take some hidden plagiarism measures to avoid the detection of the duplicate checking system. For example, they may choose some relatively unpopular or not included in HowNet as references, thus reducing the probability of being found plagiarized. In addition, they may also take some technical measures, such as modifying the paper format and rewriting word by word, to avoid the detection of duplicate checking system.

Thirdly, some graduate dissertations may indeed have high originality and academic integrity, and do not depend on the achievements and research of others. These students may pay attention to their own innovation and independent thinking when writing papers, and strictly abide by academic ethics. Therefore, even if duplication is checked, there will be no plagiarism, and the duplication checking rate is 0%.