hairspring lever

例句：

1. 1. The hairspring lever is usedto adjust the tension of the spring.
   弹簧杠杆用于调整弹簧的张力。
2. 2. The hairspring lever was designed to make it easierfor people to move heavy objects.
   弹簧杠杆设计用来使人们更容易移动重物。
3. 3.The hairspring lever was a popular toolin the early days of mechanical engineering.
   弹簧杠杆是机械工程早期非常受欢迎的工具。