The first author (the first author).
Obviously, the first author is regarded as the main finisher of the work described in the paper and the main undertaker of scientific research projects, and his popularity is extremely high.
For example, when a paper is cited, the first author of the paper is ignored in all sci-tech journals, because the citation rules can stipulate that all non-first authors use the abbreviation of "et al". At this time, the first author will not get the box lunch as early as the protagonist in the movie or TV series.
Traditionally, the first author of a science and engineering paper is the one who writes the paper, and the person who writes the paper should have the qualification to write the content of the paper, that is, the first author personally participates in scientific research projects or experiments, collects data, does experiments and analyzes the results, and ta should be the main person who completes the project.
It is also a kind of plagiarism to write a paper with other people's works without the consent of those who have done scientific research projects.
Summary:
As the first author of a paper, he is usually the main person who completes the project and writes the first draft. Usually, few people have completed a scientific research project and are willing to let others write relevant scientific papers. In nature, it is almost impossible to find an old hen who is pregnant for n months but lets others lay eggs. It is reasonable for the first author to write the first draft of the paper by the person who has completed the main work of the paper.