Whether it is useful or not depends on the specific situation and requirements. The first author is a key role in publishing papers. In various domestic reviews, the first author is the most recognized, so it is understandable that many authors want to be the first author when they publish their papers.

The first author is the main author of an article, and also the main participant in experiments and other related work, making the greatest contribution to the article. When two authors contribute equally to the article, they may consider the issue of * * * with the author.

The first thing to be clear is whether the co-author of * * * is recognized. In many academic journals, the co-author of * * * is not recognized. By default, magazines are the first, authors rank the first, authors rank the second.

If it doesn't pass the examination, it is useless to mark the same work with * * *, so we need to confirm whether it has passed the examination first. If it does pass, the works like * * * need to be marked, usually in the upper right corner of the name. The author also wants to give a brief explanation of why * * * has the same signature, and wants the editorial department to explain the specific reasons and reasons.

If the same work is not recognized, the second author is the second author, and the second author is not useless. The second author is also the key author of the paper, and can also score in the assessment, but it is not as good as the first author. So the second author is also useful. The above is the answer to whether the second work of * * * is useful.