firing spring

例句：

1. 1.The car's engine was running smoothlywhen the fire started.
   当火开始时，汽车的引擎运行平稳。
2. 2. The new modelhas a firing spring that makes it easierto start.
   新款模型有一个点火弹簧，使启动更容易。
3. 3. The old car had a worn-out firing spring, which made itdifficult to start.
   旧车有一个磨损的点火弹簧，这使得启动变得困难。