gimmick
noun [ C ] mainly disapproving uk/ˈɡɪm.ɪk/ us/ˈɡɪm.ɪk/
（尤指为诱人购买而搞的）花招，把戏;（诱人购买的）华而不实的东西，金玉其外的东西
something that is not serious or of real value that is used to attract people's attention or interest temporarily, especially to make them buy something
a publicity gimmick 广告宣传花招
They give away free gifts with children's meals as a sales/marketing gimmick. 他们给儿童套餐搭配免费礼品作为促销／营销伎俩。