According to the query of HowNet, the duplicate checking report of HowNet can be divided into two parts: the full-text repetition rate and the cited literature repetition rate. Even if other papers are cited, as long as the citation format is correct, they will generally be automatically identified as cited parts by HowNet duplicate checking software, and marked in green font, which will reflect the repetition rate when the cited documents are removed. It should be noted that the content of the quoted part should not be too long, otherwise it may be considered plagiarism. Generally speaking, the citation should be appropriate and moderate, and the content of the same document should not be quoted in large quantities, otherwise it may be marked as duplication by the duplicate checking system. Different duplicate checking systems and academic journals may have different regulations, so in practice, it is best to consult specific academic tutors or consult relevant academic norms. The correct citation method is very important, which can not only avoid repetition, but also respect and recognize the original author's works.