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发表于 2012-2-8 15:43
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[Homework]【整理】2010-05-16&05-22 Google三大核心业务之一:搜索
Hi, my name is Matt Cutts. I am an engineer at the quality group of Google. And I am like to talk today about what happens when you do a web search.
The first thing to understand is that when you do a Google search, you aren’t actually searching the web. You are searching Google’s index of the web, or at least as much as we can find. We do this with the software program called spiders. Spiders start by fetching a few web pages, then they follow the links on those pages, and fetch the pages they point to, and follow all the links on those pages and fetch the pages they link to, and so on, until it makes a pretty big trunk of the web. Many billions of pages stood across thousands of machines.
Now, suppose I want to know how fast treat can run. I typed in my search, say, treater running speed, and here returned. Our software searches our index to find every page that includes these search terms. In this case, there are hundreds of thousands of possible results.
How does Google decide which few documents I really want? By asking questions. More than two hundred of them, like, how many time does this page contain your key words, do the words appear in the title, in the url, directly or adjacent, does the page include synonyms for those words, is this page from a quality website or is it low quality, even spamming, what is this page’s page link, that’s a formula invented by our founders Larry page and ** that rates a web’s importance by looking at how many outside links point to it, and how important those links are.
Finally, we combine all those factors together to produce each page over our own score and send you back your search results, about half a second after you submit your search.
At Google, we take our commitment to delivering useful and impartial results very seriously. We don’t ever accept payment to add our site, tour index, update it more often, or improve its ranking.
Let’s take a look at my search results. Each entry includes a title, a url, and a snip of text to help me decide whether this page is what I am looking for. I also see links to similar pages, Google’s most recent store version of that page, and related searches that I might want to check next.
And sometimes, along the right, and at the top, I will see ads. We take our advertising business very seriously as well. Both our commitment to deliver our best audience for advertisers and to strive to only show ads that you those really want to see. We are very careful to distinguish your ads from regular search results. And we won’t show you any ads at all if we can’t find any that we think won’t help you find anything you are hoping for, which in this case, the treat’s running speed is more than 60 mile an hour.
Thanks for watching. I hope this make Google a little more understandable.
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