If the school uses HowNet to check the duplicate, we'd better use HowNet in the self-examination, so that the repetition rate is the most accurate. The results of other duplicate checking systems can only be used as reference or check the first draft of the paper. If the repetition rate required by the school is below 30%, then you will be below 20% in other duplicate checking systems. In this case, the probability of passing the proofreading paper detection is still very high.