You've probably seen lots of services that put pop up Windows on top of links in web pages - usually for advertising and often in unhelpful places on the page.

弹出式内容通常用于广告，并且经常放在不太重要的位置上。

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"Many people think of Internet advertising as an intrusive, interruptive experience, with dancing aliens jumping across the screen and perpetual pop-up windows, " Moloney says, adding that Scottrade favors ads that provide information that is meaningful to customers, such as a real-time stock chart it offers through an ad on Yahoo.

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