| 单词 | backgrounder | 
| 释义 | backgroundernoun  back·ground·er  ˈbak-ˌ(g)rau̇n-dər  1   : an off-the-record briefing for reporters   2   : something (such as an essay) that provides background information about a particular subject  She believes birds are the best model for understanding human language. But before making her argument, she offers a highly informative backgrounder on bird song. | 
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