Whether the citation of other people's articles in a paper is plagiarism depends on whether it is marked "citation" and whether it indicates the source and original author of the citation. If you introduce other people's articles into your own articles without explanation and regard them as part of your own papers, that is plagiarism; If the source of the quotation is clearly stated at the end of the article, it does not constitute plagiarism. In fact, the mutual citation of scientific papers is frequent, otherwise how can we "stand on the shoulders of giants"? Of course, quoting others' words in an article cannot be the main body of the article.