For example, the first author is generally the researcher who has made the greatest contribution to the work of this paper, not only contributing the most and most important charts (i.e. physical contributions), but also writing the first draft of the article (i.e. intellectual contributions). The second and third authors sign after the first author in descending order of contribution value. So there is little difference between the second author and the third author.

Of course, in comparison, the second author's gold content, contribution and sense of responsibility are higher than that of the third author, because after all, it is ahead of the third author, and the second author still has a certain weight than the third author. For the evaluation of professional titles, choosing the second author will definitely get more points and higher recognition than the third author.

The second author and the third author of the paper refer to the contributors who have made direct or indirect contributions to the work, and the overall contribution is far from that of the first author, so they are collectively called the second/third authors. The second and third authors sign after the first author in descending order of contribution value.

The first author is often the main author of an article and the author who contributes the most to it. No matter the conception, experiment, data analysis or writing of the article, the first author is the main participant, and the second author is naturally inferior to the first author in these aspects, so the second author ranks behind the first author and the second author is also the main participant.

The recognition of the first author in China is very high. In the evaluation of professional titles, many applicants are required to publish papers as the first author. It can be said that the first author is more recognized than the correspondent author, and the second author is not as recognized as the first author. The first author scored the highest in evaluation and promotion, but the score and recognition were slightly lower. If the requirements are strict and only the first author is recognized, then the second author is useless.