set their face like a flint

• vi. 下定决心

set their face like a flint的用法和样例：

例句

用作不及物动词 (vi.)

1. Our team made a stern resolve to win.
   我们队下定决心取胜。
2. I've set my sights on winning the championship.
   我下定决心要赢得冠军。