It takes time to collect in the database: Although HowNet is one of the commonly used duplicate checking systems, not all papers can be collected by HowNet. HowNet mainly includes some academic journals and conference papers. However, some articles scattered on the Internet may not be fully included. Therefore, even if the previous papers can be seen on HowNet, they may not be included in the duplicate checking system of HowNet, so they cannot be detected.

Problem of paper format: When searching for duplicates on HowNet, it is necessary to convert the paper into Word format and delete non-text contents such as headers, footers and pictures. If the paper format is incorrect, it may lead to inaccurate results of repeated inspection.

Problems with the duplicate checking system: Sometimes the duplicate checking system may fail or make mistakes, which makes it impossible to compare and identify the contents of the paper correctly. In addition, different duplicate checking systems use different databases and comparison algorithms, so they may also produce different duplicate checking results.