chain file

例句：

1. 1.The chain file is a tool used to secure documents together.
   链式文件是一种用来将文档固定在一起的工具。
2. 2. The chain file was designed to make it easier for people to access information.
   链式文件的设计是为了使人们更容易获取信息。
3. 3. The chain file was used to connect different sections of the document.
   链式文件被用来连接文档的不同部分。