game changer
noun [ C ] uk/ˈɡeɪm ˌtʃeɪn.dʒər/ us/ˈɡeɪm ˌtʃeɪn.dʒɚ/
在很大程度上改变一场比赛结果的人（或事）
something or someone that affects the result of a game very much
As a player he can be a game changer. 作为队员他可以是一名改变比赛结果的人。
在很大程度上改变形势（或商业领域）的产品（或事件）
something such as a product or event that affects a situation or area of business very much
The hit show has been a game changer for the network. 这一热门节目很大程度上改变了这家电视网络。