index file

例句：

1. 1. The index file is a crucial tool for organizing information.
   索引文件是组织信息的关键工具。
2. 2. The index file contains all the essential information about the product.
   索引文件包含了关于该产品的所有重要信息。
3. 3. The index file was created to help users quickly find relevant information.
   索引文件的创建是为了帮助用户快速找到相关信息。