1. The research method is unclear or inaccurate: if the research method of the paper is not fully explained or there are obvious errors, the reviewer may choose to reject it.
2. Insufficient data or analysis: the data and analysis of the paper are the core parts. If the data and analysis are insufficient, the quality of the paper may be very low.
3. The conclusion is unclear or meaningless: the conclusion of the paper should be clear and meaningful. If the conclusion is vague or meaningless, it may be rejected.
4. The structure of the paper is chaotic: the structure of the paper should be clear. If the structure is chaotic, it may affect the reader's reading experience and be rejected.
5. Language problems: If there are problems with the language of the paper, such as grammatical mistakes and spelling mistakes, it may also be rejected.
6. Repeated publication: If the content of the paper is duplicated with the published paper, or some papers have been published elsewhere, it may also be rejected.
7. Not conforming to the theme or scope of periodicals: each periodical has its own theme and scope. If the content of the paper does not meet the requirements of the journal, it may be rejected.
8. Lack of innovation: scientific research papers need to be innovative. If the content of the paper lacks innovation, it may be rejected.
9. Insufficient or inappropriate references: References are an important part of the paper. If the cited references are insufficient or inappropriate, the quality of the paper may be affected.
10. Unreasonable experimental design: If the experimental design of the paper is unreasonable, the reliability and validity of the experimental results may be questioned.