| 摘要 |
Methods, systems, and apparatus, including computer program products, in which contextual bids for an auction are provided for advertisement requests for presentation of an advertisement in an identified context. Each contextual bid is based on an effectiveness measure associated with a corresponding advertisement and the identified context. Each corresponding advertisement can be served in a plurality of contexts, and the corresponding advertisement has a corresponding plurality of effectiveness measures, each effectiveness measure determined from evaluation results received from evaluations conducted in the plurality of contexts.
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