poster child

noun

/ˈpəʊstə tʃaɪld/

/ˈpəʊstər tʃaɪld/

(also poster boy, poster girl)

(especially North American English)

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a child with a particular illness or other problem whose picture appears on a poster advertising an organization that helps children with that illness or problem（为慈善等目的）出现在海报上的儿童
(often humorous) a person who is seen as representing a particular quality or activity代表人物；典型
- He is the poster child for incompetent government.他是无能政府的典型人物。