Although there seem to be many duplicate checking services on Zhiwang, there are not many real formal duplicate checking services on Zhiwang. Therefore, it is very important for college students to know the formal duplicate checking service on the Internet. The duplicate checking of graduate papers is generally handled by teachers in graduate schools. Therefore, teachers in graduate schools are most familiar with duplicate checking of HowNet papers. Every year, thousands of dissertations pass the test of HowNet papers, saying that they are unfamiliar.