lever spring

例句：

1. 1. The lever spring is used to adjust the tension of the cable.
   杠杆弹簧用于调整电缆的张力。
2. 2.The spring in the door is broken, causing the door to open automatically.
   门上的弹簧坏了，导致门自动打开。
3. 3.The spring was designed to store energy and release it when needed.
   弹簧被设计来储存能量并在需要时释放。