| 摘要 |
Methods, systems, and apparatus, including computer program products, for selecting advertisements. A request for sponsored content for presentation with a content item in a document is received. One or more candidate sponsored content items are identified based on one or more criteria. The criteria includes information related to the content item independent of the document, and information related to the document. One or more of the candidate sponsored content items are selected. The selected sponsored content items are transmitted for presentation with the content item.
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