Comparison shopping engines like Bizrate, Shopzilla, and Nextag can serve display ads based on the products people are searching for.

像Bizrate、Shopzilla和Nextag这样的比较购物引擎可根据用户搜索的产品提供显示广告。

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Search engines, online price comparison services and discovery shopping engines can be used to look up sellers of a particular product or service.

搜索引擎，在线价格比较服务和购物搜索引擎都可以用来寻找个别特殊产品或服务的卖家。

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Shopping Though some shopping websites have comparison engines built in to their interface, many do not.

商场虽然一些购物网站已经比较引擎中内置的界面，许多人不。

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Google has been accused in both Europe and the United States of using its dominant position in search to unfairly promote its own products and services -- from travel and shopping comparison engines to advertising and mapping.

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