海報上的那張臉，以及被它借去的比喻
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child on a charity poster · noun
A child whose photograph is used on a poster by an organization, to show the illness or difficulty that it is raising money to help children with.
（慈善海報上的）代表孩童
Picture a fundraising poster at a bus stop with one child's face blown up large. That single face is standing in for thousands of others: you look at it and you think of the whole cause. Everything the phrase does today comes from that one face on the poster.
可以想成公車站牌上的一張募款海報，上面放大著一個孩子的臉。那一張臉替上千個孩子站在那裡：你看到他，就想到整件事。這個詞今天所有的用法，都是從海報上那張臉長出來的。
From the word’s history
The phrase comes from the practice of using appealing young people and children in charitable advertisements.
這個說法來自慈善廣告的做法：用討人喜歡的孩子或年輕人來做宣傳。所以「海報上的孩子」不是後來的聯想，它就是這個詞本來在講的事。
Wiktionary, "poster child"
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