brake key

例句：

1. 1.The car's brake key is broken, so we need to find a replacement.
   车的刹车键坏了，我们需要找一个替代品。
2. 2.He tried to use the brake key to stop the car, but it didn't work.
   他试图用刹车键来停止汽车，但没能成功。
3. 3.The mechanic replaced the brake key and tested the car's brake system.
   机械师更换了刹车键并测试了汽车的刹车系统。