Google的技术剖析：

• 100.00% (no date) (0K)
  http://www.whitehouse.gov/
  Office of the President
  99.67% (Dec 23 1996) (2K)
  http://www.whitehouse.gov/WH/EOP/OP/html/OP_Home.html
  Welcome To The White House
  99.98% (Nov 09 1997) (5K)
  http://www.whitehouse.gov/WH/Welcome.html
  Send Electronic Mail to the President
  99.86% (Jul 14 1997) (5K)
  http://www.whitehouse.gov/WH/Mail/html/Mail_President.html
  mailto:president@whitehouse.gov
  99.98%
  mailto:President@whitehouse.gov
  99.27%
  The "Unofficial" Bill Clinton
  94.06% (Nov 11 1997) (14K)
  http://zpub.com/un/un-bc.html
  Bill Clinton Meets The Shrinks
  86.27% (Jun 29 1997) (63K)
  http://zpub.com/un/un-bc9.html
  President Bill Clinton - The Dark Side
  97.27% (Nov 10 1997) (15K)
  http://www.realchange.org/clinton.htm
  $3 Bill Clinton
  94.73% (no date) (4K) http://www.gatewy.net/~tjohnson/clinton1.html
  　

  　

  
  　

  Figure 4. Sample Results from Google
  The most important measure of a search engine is the quality of its search results. While a complete user evaluation is beyond the scope of this paper, our own experience with Google has shown it to produce better results than the major commercial search engines for most searches. As an example which illustrates the use of PageRank, anchor text, and proximity, Figure 4 shows Google's results for a search on "bill clinton". These results demonstrates some of Google's features. The results are clustered by server. This helps considerably when sifting through result sets. A number of results are from the whitehouse.gov domain which is what one may reasonably expect from such a search. Currently, most major commercial search engines do not return any results from whitehouse.gov, much less the right ones. Notice that there is no title for the first result. This is because it was not crawled. Instead, Google relied on anchor text to determine this was a good answer to the query. Similarly, the fifth result is an email address which, of course, is not crawlable. It is also a result of anchor text.
  

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