Under normal circumstances, there are two or three duplicate checks. When the paper is just written, that is, the first draft, it needs to be tested once. At this time, the check will be higher, and then it will be revised according to the test results, and then it will be tested. This process is basically at least 1 time, depending on your own modification and repeated inspection results. After the final revision of the article, there will definitely be a final draft check, which is also the most important check!