Let's talk about the principle of duplicate checking first. At present, the commonly used authoritative duplicate checking websites mainly include China Knowledge Network and Wanfang Database. No matter what kind of duplicate checking method, the principle is to compare the paper with the published article. For comparison, there are not only papers published in journals, but also excellent master's and doctoral theses. In short, the database will compare the published articles with the papers used for duplicate checking. If the similarity of a single sentence or a whole paragraph is too high, the repetition rate of the paper will be high.
On the one hand, the high repetition rate of papers is related to the topic selection. Many graduates will choose popular research topics in order to pass the examination of their own papers, and there will inevitably be many people to study them. It is impossible to put forward completely innovative ideas by virtue of students' ability, so his articles will have many repetitions with others.
On the other hand, the use of technical terms and language habits will also lead to high repetition rate. Graduation thesis will involve the explanation of technical terms and technical terms. The standard definition of technical terms is unified, and graduates can't modify the definition, so the repetition rate will be high. And everyone's language habits are similar, and the expression of the same sentence is basically the same, so what if it appears in the article? A cliche? Then it is inevitable that this sentence is basically similar to the published paper.
Of course, in addition to the above two reasons, there is another reason for the high repetition rate of the paper, that is, this article was originally plagiarized. Some students don't study well, don't pay attention to knowledge accumulation, and can't write anything in their graduation thesis. In order to graduate, they have to copy sentences published by others for a long time. The repetition rate of articles written in this way is naturally high.
In fact, the high repetition rate of papers does not necessarily mean that this article is plagiarized, but in order to prevent academic misconduct, strictly controlling the repetition rate of papers is also an important way to reduce the possibility of plagiarism.