ˈposter ˌchild noun [countableC usually singular] American EnglishAmE 1. a child with a particular illness or physical problem whose picture appears on a poster advertising the work of an organization that helps children with that problem 〔公益广告中的〕海报儿童，代言儿童
2 someone or something that represents a particular quality, idea etc – often used humorously 典型人物，典型事物〔常为幽默用法〕 Dillon is the poster child for wasted talent. 狄龙是典型的被埋没的人才。