How Do Search Engine Work? 搜索引擎如何运作？
- 详细资料
- 创建于 2003年9月02日
- 最后更新于 2024年5月25日
- 发布于 2011年6月06日
- 作者：Mike Lee
- 点击数：299
课文朗读
课文讲解
Polly runs into her co-worker Harvey at an Internet café: 宝莉在网咖碰到她的同事哈维：
H: Gosh, these search engines are quick. My search of the Web only took 0.09 seconds.
天啊，这些搜索引擎好快。我在网络系统上搜寻只花了0.09秒。
P: Actually, search engines don’t search the entire Web, only their own databases. For example, Google, which claims to have the largest index, has a database of over three billion pages.
事实上，搜索引擎并不搜寻整个因特网，而只搜寻它们自己的数据库。例如，号称有最大索引的Google有超过30亿页的数据库。
H: How can they build up such a phenomenal database? It must be automated.
他们如何建立起这么惊人的数据库？一定是自动化。
P: There are human-powered directories, but most search engine databases are built by programs called “spiders.” These automated programs crawl through the Web, “read” a webpage, and follow its links to other pages. Then they pass the pages to another program for indexing.
有人工的指南，但大部分搜索引擎的数据库是由称为「蜘蛛」的程序所建立的。这些自动程序在网络中四处游走，每「阅读」一个网页后，循着网页的连结到其它的网页。然后这些网页便交由另一个程序做成索引。
H: Spiders couldn’t possibly crawl the entire Web, so there must be loads of sites that aren’t listed.
蜘蛛程序不可能爬完整个网络，所以一定有很多网站没被列出来。
P: Absolutely. Search engines present the “visible” Web, but it’s estimated that the “invisible” Web is two or three times bigger.
没错。搜索引擎提供的是「看得到」的网络系统，但是据估计，「看不到」的网络系统有两三倍之谱。
H: Very mysterious. Back to the visible Web, I can guess the next part: search engine software sifts through the billions of pages in the index to find matches by keyword or whatever, and then it ranks the results in order of relevancy.
好神秘。回到看得见的网络系统，我猜得出后面的部分：搜索引擎软件藉由关键词或是什么的在索引里筛选数十亿个网页以找寻配对，然后以关联性将结果排序。
P: How each engine determines relevancy is top secret, however.
然而，各家引擎如何决定关联性则是最高机密。
H: I’m just hoping your phone number isn’t top secret!
我只希望妳的电话号码不是最高机密。
－by Hector Magruder
Vocabulary
单词发音
run into 偶然碰到
the Web 网络
index [ˋɪndɛks] n. 索引
phenomenal [fəˋnɑmən!] adj. 异常的；杰出的；惊人的
directory [dəˋrɛktərɪ] n. 指南，使用手册
crawl [krɔl] v. 爬，爬行; 缓慢地移动，徐徐行进
load [lod] n.【口】大量，许多，一大堆[P][（+of）]
sift through 被筛下, 通过
rank [ræŋk] n. 排列，把……排成行
relevancy [ˋrɛləvənsɪ] n. 关联
Sentence of the Day
She blinded him with science.
她用深奥的术语让他无言以对。
blind someone with science 炫示科技知识使某人摸不着头脑