On the whole, of course, be cautious. If you quote more than 20 words in a row without indicating the source, it is plagiarism. If you take notes, you must also take notes in the prescribed format. At the same time, the quotation in this paper needs to be written in a font different from the main content. Generally, the other paragraph of the main content needs to be empty by two characters, the reference paragraph needs to be empty by four characters, and the following lines from the second line need to be empty by two characters.