1, contribution degree: The first author is the author who contributes the most to the paper under normal circumstances and is responsible for the main research contents of the paper. Correspondents are mainly responsible for the coordination and management of the whole research project, not necessarily the specific researchers of the paper.

2. Responsibility and obligation: The first author needs to be responsible for the authenticity and scientificity of the content of the paper and explain the research results of the paper to the outside world. Correspondents are responsible for foreign exchanges, explaining research results and conducting a comprehensive inspection of the whole research project.