The index speeds up linking with the static library and allows routines in the library to be called, irrespective of their actual placement inside the library.
该索引可以提高与静态库进行连接的速度，并允许调用库中的例程，而不考虑它们在库中的实际位置。
2
Your internal pages will not appear in the search engine index without the proper linking structure to internal pages for the spider to follow.
如果链接结构没有遵循规则，你的内部页面是不会被索引到的。
3
Because of the linking problem (described above) the index page need to be created by the portlet.