poster child

1. N-COUNT If someone is a poster child for a particular cause, characteristic, or activity, they are seen as a very good or typical example of it. 榜样[美国英语]

Zidane has become the poster child for a whole generation of French-born youths of North African extraction. 齐达内已成为法国出生、北非血统的一整代青年的榜样。