These resources are far better for that purpose than any printed book's table of contents or index.
这些资源要比任何形式的打印出来的目录和索引要好的多。
An index is an alternative way to read a printed text, but it is only one of many ways to read a hypertext.
索引是阅读印刷文本的二选一的方式，但对于阅读超文本来说，它只是许多方式中的一种而已。
Essentially, this means the index. A printed manual has an index in the back that you use manually. Online help has an automatic index search facility.
这基本上取决于索引质量，打印手册后面有一个索引，在线帮助有一个自动索引搜索工具。
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