that will collect data from the Web for our search engine.

他們將為我們的搜尋引擎，從網路上收集資料

And to learn about big ideas in Computing by doing that.

藉由建立網頁蜘蛛，也會學到計算的重要觀念

In Unit 1, we'll get started by extracting the first link on a web page.

在第一單元，我們從擷取網頁上第一個連結 (link) 開始

A Web crawler finds web pages for our search engine

網頁蜘蛛會為我們的搜尋引擎尋找網頁

by starting from a "seed" page and following links on that page to find other pages.

從種子頁面 (seed page) 開始，然後跟隨著頁面上的連結 (link)，找到其他的網頁

Each of those links lead to some new web page, which itself could have links that lead to other pages.

每一個連結 (link) 通往某些新網頁，這些新網頁本身也可能有 links 通往其他網頁

As we follow those links, we'll find more and more web pages

當我們跟隨這些 links，我們會發現更多、更多的網頁

building a collection of data that we'll use for our search engine.

這些網頁形成了資料庫，我們將在搜尋引擎中做運用

A web page is really just a chunk of text that comes from the Internet into your Web browser.

網頁 (web page) 實際上只是一大塊文字，從網際網路 (internet) 來到你的網頁瀏覽器

We'll talk more about how that works in Unit 4.

我們將在第四單元討論更多關於網頁的運作方式

But for now, the important thing to understand is that

但是現在，重要的是要瞭解

a link is really just a special kind of text in that web page.

link 實際上只是網頁中一種特殊的文字

When you click on a link in your browser it will direct you to a new page.

當你點擊瀏覽器中的 link，它會引導你到新網頁

And you can keep following those links as a human.

你可以繼續跟隨這些 links

What we'll do in this Unit is write a program to extract that first link from the web page.

在這個單元中，我們要做的事，就是寫一個程式，從網頁中擷取第一個 link

In later units, we'll figure out how to extract all the links and build their collection for our search engine

在後面的單元，我們要知道如何擷取所有的 links，並且為我們的搜尋引擎蒐集資料