First of all, one possible reason why the duplicate check report shows zero is that the paper is not plagiarized or plagiarized. This means that graduate students have a good sense of academic norms in the process of writing their papers, and they have done rigorous writing according to the writing norms of graduate papers. They fully understand and respect intellectual property rights, thus avoiding the act of directly copying other people's opinions, theories or words. In addition, they also fully cited other people's research results, and correctly indicated the source and citation method, ensuring the academic integrity of the paper.

Secondly, another possible reason why the duplicate checking report shows zero is that graduate students use a high-quality duplicate checking system. Under the condition of modern science and technology, the duplicate checking system has become universal and easy to use. Different duplicate checking systems will use different algorithms and detection methods to check the duplicates of papers, and the results may be different. Some duplicate checking systems with low quality and simple detection methods may not be able to detect some similar contents in the paper, resulting in the duplicate checking report showing zero. However, if graduate students choose to use high-quality duplicate checking system and carry out duplicate checking operation according to the requirements of the system, the originality and academic integrity of the paper can be fully guaranteed.

Finally, another possible reason is that there is an error in the duplicate check report of the paper. Although we generally believe that the duplicate checking system is accurate and reliable, there are still some mistakes. Sometimes, due to unreasonable algorithm design or untimely update of the duplicate checking system, some similar contents may be identified incorrectly, so that the duplicate checking report shows zero. In this case, graduate students should communicate with tutors or teachers to find and correct such mistakes in time.

To sum up, the reason why the duplicate checking report shows zero may be because graduate students have not plagiarized or plagiarized their papers, and they have used a high-quality duplicate checking system to carry out strict duplicate checking operations, or it may be caused by an error in the duplicate checking system. Whatever the reason, it highlights the academic level and academic integrity of graduate thesis. However, it should be noted that the zero-repetition report cannot absolutely guarantee the originality of the paper, and further evaluation and review are needed.