Take the example of the ubiquitous file folder in modern computer operating systems. As a mechanism for organizing documents, it is quite easy to learn and understand because of its similarity to a physical file folder in a file cabinet.

• 以现代计算机操作系统中到处都在使用的文件夹为例，作为组织文档的机制，这种方式非常容易学习和理解，因为它和现实生活中的文件柜里的文件夹类似。