Normally when a user types in a query into a search engine the advertising placed alongside the search results is dependent on what the user has search for and/or geographic loction.
正常来说，当用户在搜索引擎上输入一个查询，在搜索结果的旁边便会出现根据用户所搜索的内容和/或其所处的地理位置显示相应的广告。
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