“game face”可不要直接翻译为“游戏脸”，其实表示“准备好应对某个棘手的事情或者迎接挑战时的表情”。

【例句】
As soon as they encounter something difficult, they put on their game faces.
他们只要一遇到棘手的事情，就会表现得很严肃。

Every morning, no matter what had happened the night before, she got up and put her game face on.
每天早晨，无论昨天夜里发生了什么，她都会精神抖擞地起床开始化妆。