to talk today about what happens when you do a web search. The first thing to understand

今天我要介紹的是網頁搜尋的運作原理 首先我們要澄清的是

is that when you do a Google search, you aren't actually searching the web, you're searching

您在使用 Google 進行搜尋時 並不是真的搜尋了整個網路

Google's index of the web, or at least as much of it as we can find. We do this with

而是在搜尋 Google 的網頁索引 或者是我們盡可能找到的網頁索引

software programmes called spiders. Spiders start by fetching a few web pages, then they

我們使用自動尋檢程式來尋找網頁 它一開始會擷取少量網頁

follow the links on those pages and fetch the pages that they point to, and follow all the

追蹤這些網頁上的連結 然後擷取連結指向的網頁

links on those pages, and fetch the pages they link to and so on, until we've indexed a pretty

再追蹤網頁上的連結 再繼續擷取指向的網頁，以此類推

big chunk of the web - many billions of pages stored across thousands of machines. Now,

直到我們將大部分網頁編入索引 這些網頁就是儲存在數千台電腦內的數十億個網頁

suppose I want to know how fast a cheetah can run. I type in my search, say, 'cheetah

現在，假設我想知道獵豹能跑多快 可以在搜尋框中輸入「獵豹 奔跑 速度」

running speed' and hit return. Our software searches our index to find every page that

然後按下 Return 鍵 我們的軟體就會搜尋索引

includes those search terms. In this case, there are hundreds of thousands of possible

找出所有含有這些搜尋字詞的網頁 在這個例子中，就有成千上萬筆搜尋結果

results. How does Google decide which few documents I really want? By asking questions - more

Google 如何判斷哪些文件符合需求呢？ 我們會詢問 200 個以上的問題

than 200 of them. Like, how many times does this page contain your keywords? Do the words

比方說 您的關鍵字在這個網頁出現幾次？

appear in the title, in the URL, directly adjacent? Does the page include synonyms for

關鍵字是否位在標題或網址中 還是彼此相鄰？網頁內有沒有同義字？

those words? Is this page from a quality website or is it low quality, even spamming? What

這個網頁是來自內容可靠的網站 品質低劣的網站、還是垃圾網站？

is this page's PageRank? That's a formula invented by our founders, Larry Page and Sergey

網頁的 PageRank 是多少？ PageRank 公式是由 Google 創辦人

Brin, that rates a web page's importance by looking at how many outside links point to

Larry Page 和 Sergey Brin 共同開發 它會根據指向網頁的外部連結數量

it and how important those links are. Finally, we combine all those factors to produce

及這些連結的重要性來評估網頁的重要程度 最後，我們會彚整所有因素

each page's overall score and send you back your search results about half a second after

算出網頁的整體分數 並將搜尋結果回傳給您，整個過程都在

you submit your search. At Google, we take our commitment to delivering useful and impartial

提交搜尋後約半秒內完成 Google 的重要使命就是要為使用者

search results very seriously. We don't ever accept payment to add a site to our index,

提供實用且客觀的搜尋結果 絕不會透過收費方式將網站加入索引

update it more often or improve its ranking. Let's take a look at my search results. Each

提高網站的更新頻率，或提升網站排名 現在來看看我的搜尋結果

entry includes a title, a URL and a snippet of text to help me decide whether this page

每個項目都有一組標題、網址及文字片段 有助於判斷網頁是否符合我要尋找的內容

is what I'm looking for. I also see links to similar pages, Google's most recent stored

此外，還有類似網頁的連結 和最新的 Google 頁庫存檔

version of that page and related searches that I might want to try next. And sometimes,

以及我可能會感興趣的相關搜尋

along the right and at the top, I'll see ads. We take our advertising business very seriously

有時網頁右側和頂端也會顯示廣告 我們非常重視廣告業務

as well, both our commitment to deliver the best possible audience for advertisers and

我們不僅承諾要為廣告客戶 吸引最佳的目標對象

to strive to show only ads that you really want to see. We're very careful to distinguish

也致力於只為您提供有助益的廣告 我們會嚴格區別廣告和一般搜尋結果

your ads from regular search results, and we won't show you any ads at all if we can't

如果我們認為沒有任何廣告 能協助您找到需要的資訊

find any that we think will help you find the information you're looking for - which,

就不會在搜尋網頁上顯示任何廣告

in this case, the cheetah's top running speed, is more than 60 miles an hour. Thanks for

在本例中 獵豹的最快奔跑速度為每小時 60 英里以上

watching, I hope that this made Google a little bit more understandable.

感謝您的收看！ 希望這段介紹能讓您更加瞭解 Google