根据WIKI上的资料:
The order of search results on Google's search-results pages is based, in
part, on a priority rank called a "PageRank".
PageRank is a link analysis algorithm, named after Larry Page and used by
the Google Internet search engine, that assigns a numerical weighting to
each element of a hyperlinked set of documents, such as the World Wide Web,
with the purpose of "measuring" its relative importance within the set.
The rank value indicates an importance of a particular page.
A page that is linked to by many pages with high PageRank receives a high
rank itself.
这不至少体现了popularity 和 importance 么?