First of all, we need to understand the working principle of the paper duplicate checking system of HowNet. The system calculates the similarity between the uploaded papers and the academic papers in the database, and judges the originality of the papers. When calculating similarity, it is mainly based on text similarity algorithm, such as cosine similarity. In the process of duplicate checking, the contents of the paper will be uploaded to the system for comparison, but the system will not modify the paper in any form, so it will generally not leave traces of duplicate checking.

Secondly, some people worry that HowNet may record the papers uploaded by users for subsequent analysis and duplicate checking services. However, according to the official statement of HowNet, they strictly abide by relevant laws, regulations and privacy protection policies, and the papers uploaded by users are only used for duplicate checking purposes and will not be leaked or used for other illegal purposes.

Therefore, in theory, using the paper duplicate checking system of HowNet will not leave duplicate checking marks. However, in practice, in order to ensure the originality and academic integrity of the paper, the author should try to avoid using excessive quotations and copying other people's research results, which can better ensure the passing rate of the paper in the duplicate checking system.

The author should pay attention to the following aspects when using the duplicate checking system of HowNet papers. First of all, ensure that the uploaded paper is the author's own original research results to avoid plagiarism and plagiarism. Secondly, when quoting other people's research results, use quotation marks and references reasonably to ensure respect for intellectual property rights and maintenance of academic integrity. Finally, the possible repetition or similar content in the paper should be revised in time to avoid system misjudgment.

To sum up, the paper duplicate checking system of HowNet generally does not leave duplicate checking marks in the duplicate checking process. However, when writing a paper, the author should still pay attention to academic integrity, avoid improper quotation and plagiarism, and ensure the originality and academic level of the paper.