There are two definitions of plagiarism: one is plagiarism, which uses other people's opinions without specifying them, making people mistakenly think it is your own; One is plagiarism, copying other people's written expressions, not indicating the source, using quotation marks, making people mistakenly think that it is your own expression.

However, the importance of these two definitions to the thesis will be different. Generally, undergraduate graduation thesis will only strictly test the latter, and the requirements for the former are not so strict.