Direct quotation is also acceptable, but a footnote should be added to indicate the source, and the comment part cannot be quoted directly.

When writing a paper, you can quote cases from other people's articles. Of course, you should also make corresponding reference marks when drinking.

At the same time, you should analyze the case from your own point of view after quoting the case, and you can't completely use other people's languages, otherwise it will become plagiarism. Of course, a paper can't quote too many.