We don't need to list all the restrictions, and we don't need to take the trouble to introduce them. The specific number of words can be expanded according to the subject and research questions. Some may be a few moves (although few, but there must be), while others need to be done slowly and steadily. Reflect the specific limitations, explain the impact of these limitations on this study, and explain why the research methodology is still used. Don't generalize.

(2) length and content

Insufficient research can increase the credibility of research papers, but the length should be controlled within a reasonable range (about 500 words), and it is not allowed to pretend to be the moderator. Limitations can not affect the core idea of the paper and the whole argumentation process, otherwise the existence of the core idea will be questioned and the value of the paper will be greatly reduced. The limitation of research should be a problem that researchers can't overcome with their best efforts under the existing conditions. Although there are subjective factors to some extent, don't take them as the main content, which will affect the scientificity, objectivity and rigor of the paper. Usually, the limitations of research should be discussed on specific issues, and should not involve the logical framework of the whole argument. If there are defects in the overall frame structure, the research results will have an essential impact and the credibility of the paper will be greatly weakened.