rack lever spring

例句：

1. 1. The car's engine isrunning smoothly due to the new rack leverspring installed.
   由于安装了新的曲柄杠杆弹簧，汽车的引擎运行得非常顺畅。
2. 2. The old clock had a broken springand needed to be replaced with a newrack lever spring.
   旧时钟的弹簧坏了，需要用一个新的曲柄杠杆弹簧来替换。
3. 3. The engineer used a rack leverspring to adjust the tension of the rope.
   工程师使用一个曲柄杠杆弹簧来调整绳索的张力。