Often, companies simply pay sites to distribute their tracking files.

通常，公司付费给网站来发布他们的追踪文件。

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Pay attention to referrer sites: it reveals what visitors are reading or using.

留意引用站点：它显示了什么样的访客正在阅读或使用。

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Some sites even have to pay some money to be indexed.

甚至一些网站为了能够被编入索引库不得不付一些钱。

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There is also debate about the desire of some Internet providers to offer special treatment to sites willing to pay for it.

VOA: special.2009.09.25

Advertisers pay the sites according to page views, turning those clicks into dollars.

FORBES: $240 To Place Story On Digg Front Page: One Marketing Firm's Pitch

Now you can surf the Web without all those flashing, winking, bandwidth-sucking banners (that happen to pay for the sites you're visiting).

CNN: Top 10 hot Internet tools

The move has left thousands of Vatican visitors and pilgrims scrambling to find alternate ways to pay for popular sites, including Vatican Museums, as well as souvenirs, gifts and meals.

BBC: Cash-only for visitors to the Vatican