关键词是是论文核心内容的高度概括，对揭示和描述文献主题内容有着重要和关

Keywords are a high-level summary of the core content of the paper, and play an important and key role in revealing and describing the subject content of the literature [10]. The key words of 46 articles were counted, and 96 key words were obtained. Among them, there are 3 with a frequency of 10 and above, accounting for 0.31% of the total number of keywords, 15 with a frequency greater than or equal to 3, accounting for 15.6% of the total, and 78 with a keyword frequency of 1, accounting for 81.2% of the total. The highest frequency is the "University Ranking" and the "Index System" both are 18.

关键词是是论文核心内容的高度概括，对揭示和描述文献主题内容有着重要和关键性作用[10]。对46篇文献的关键词进行统计，共获得关键词96个。其中频次在10及以上有3个，占关键词总数的0.31%，频次大于等于3的有15条，占总数的15.6%，关键词频次为1的有78条，占总数的81.2%。频次最高的是“大学排名”和“指标体系”均为18。

Key words are the high generalization of the core content of the paper, and play an important and key role in revealing and describing the subject content of the literature [10]. A total of 96 keywords were obtained from 46 literatures. Among them, there are 3 with the frequency of 10 or above, accounting for 0.31% of the total keywords, 15.6% of the total number of keywords with frequency greater than or equal to 3, and 78 keywords with frequency of 1, accounting for 81.2% of the total. The highest frequency is "university ranking" and "index system", both of which are 18.