2. Make appropriate additions or deletions. For the paper duplication detection system, the standard to judge whether there is plagiarism in the paper content is generally how many characters are the same or how many keywords are the same, that is, plagiarism exists. Faced with such a situation, we can insert words or break sentences, which can be different from the original sentences.
3. Sentence pattern conversion. In fact, sentence pattern transformation is actually to change the sentence, rearrange the words of the sentence, and then re-form a sentence. For example, we can change the declarative sentence of a sentence into a question, change it into a passive sentence and so on.