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。

youdao

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。

youdao

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。

youdao

Comscore says the average U.S. web surfer watches 14.8 hours of online video per month.

FORBES: The Data Explosion and the Networked Enterprise

He says the same surf cams that check the surf also tell a Web surfer when the beach is too crowded.

CNN: To surf the Web or surf the surf?

But does that introduce too much complexity for the average web surfer?

FORBES: Cryptocat Increases Security In Move Away From JavaScript Web Delivery