In the paper duplication checking system, both Chinese and English papers will be regarded as duplicates as long as they are cited in the papers. Different duplicate checking systems have different algorithms and databases, so the duplicate checking results will be different. Commonly used duplicate checking systems include HowNet, paperfree, papertime, VIP and so on.

This is because the duplicate checking system will identify the cited part of the paper according to the format and citation specification of the paper and compare it with the literature in the database. If the cited content is similar or the same as the literature in the database, it will be regarded as duplicate content.

However, it is allowed to quote others' achievements reasonably in the paper, which is also a part of academic norms. Therefore, when quoting, you need to pay attention to the format and specification of the quotation to ensure that the quoted content will not be identified as plagiarism or repetition. At the same time, you can also add your own views and opinions when quoting, so as to increase the innovation and uniqueness of the paper.