Every web surfer, in the course of his or her browsing, has been forced to stop and perform this weird little task.
每一个互联网用户在浏览的过程中，都不得不停下来完成一个奇怪的小任务。
Like AdWords, these AdSense advertisements are "contextual" -relevant to the web page's content-and the advertiser pays for them only when a web surfer clicks.
和AdWords一样，这些AdSense也是“情景化的”—跟相应网页的内容有关—只有当广告被网上冲浪者点击的时候，广告主才需要付费。
Every web surfer, in the course of his or her browsing, has been forced to stop and perform this weird little task: look at a picture of some wavy, ghostly, distorted letters and type them into a box.
每一个互联网用户在浏览网页的过程中，都不得不停下来完成一个奇怪的小任务：将一张图片中波浪的、朦胧的或者扭曲的字母辨认出来，并把它们填到一个小方框里。
After following the instructions in this article, Figure 1, shown below, is an example of what the server operators will see on the left, and what the Web surfer will see on the right.
按照本文的说明进行操作之后，将会得到下面图1所示的示例，在这里，服务器操作人员看到的是左边的内容，而Web浏览者看到的是右边的内容。
After following the instructions in this article, Figure 1, shown below, is an example of what the server operators will see on the left, and what the Web surfer will see on the right.
按照本文的说明进行操作之后，将会得到下面图1所示的示例，在这里，服务器操作人员看到的是左边的内容，而Web浏览者看到的是右边的内容。
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