但是在因特网上，广告商们将广告放在哪里越来越取决于有多少网站对网络冲浪者的了解。
But on the Internet, advertisers are increasingly choosing where to place their ads based on how much sites know about Web surfers.
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。
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.
现在大多数的手机广告策略是依赖于短信，因为很少有用户喜欢为他们精心提供的服务，包括可以下载音乐、游戏、视频和网上冲浪。
Most mobile advertising strategies now rely on text messages, since few customers have taken to more elaborate services that allow them to download music, games and videos and to surf the web.
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