index term

例句：

1. 1. The index term for this document is "computer science."
   这份文件的索引项是“计算机科学”。
2. 2.The researchers used the index term to identify the most relevant studies.
   研究人员使用这个索引项来识别最相关的研究。
3. 3. The index term was chosen to ensure that all documents were included in the search results.
   选择这个索引项是为了确保所有文档都包含在搜索结果中。