poster child
noun [ C ] uk/ˈpəʊ.stə ˌtʃaɪld/ us/ˈpoʊ.stɚ ˌtʃaɪld/ (also poster boy, poster girl)
代表人物形象;典型事物
someone or something that is used to represent a particular quality
He is a poster boy for political reform. 他的形象代表了政治上的改革。
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