以下为句子列表：
英文: A concept in media planning stipulating that a certain amount of exposure to an advertising message is necessary before it is effective. Often used interchangeably with the term effective frequency.
中文: 广告媒介策划中使用的概念.指受众必须有一定的广告暴露频率,广告才能发生效用.经常与有效频率交替使用.
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