brakes制动器;刹车;阻力;车闸;障碍 jam on the brakes 急刹车

【例句】
I had to jam on the brakes sharply to avoid hitting two schoolchildren.
我不得不紧急刹车以避免撞倒两个小学生。

I had to jam on the brakes in order to avoid the accident.
为了避免发生车祸，我不得不紧急刹车。