The crawling strategy and topic relevance algorithm of web spider is the core for vertical search engines.

在垂直搜索引擎中，网络蜘蛛的爬行策略和主题相关性判定算法是其核心。

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These could be used, for instance, to construct vertical search engines that could run on Alexa's own servers or elsewhere.

这些可以用，例如，建造垂直搜索引擎，可以运行在Alexa的自己的服务器或其他地方。

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SEO may target different kinds of search, including image search, local search, video search and industry-specific vertical search engines.

SEO会定位于不同类型的搜索，包括图片搜索，本地搜索、视频搜索和特定行业的垂直搜索引擎。

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Among the share stealers are so-called vertical search engines such as Amazon that beat Google when it comes to searching for a narrower purpose.

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While competitors such as Microsoft and vertical search engines such as Nextag have complained and will continue to complain that Google favors its own services unfairly, others think the FTC case was weak in the first place.

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The company will also systematically highlight links to rival specialised, or "vertical", search engines.

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