hairspring pin

例句：

1. 1.The hairspring pin is a crucial component in the circuitry of the watch.
   这个弹簧针是手表电路中的关键部件。
2. 2.The technician carefully inserted the hairspring pin into the spring.
   技术人员小心翼翼地将弹簧针插入弹簧。
3. 3. The hairspring pin was responsible for holding the gear together.
   这个弹簧针负责将齿轮连接在一起。