slow-operating relay

例句：

1. 1. The slow-operating relay was used to control the speed of the motor.
   慢动作继电器用于控制电机的速度。
2. 2. The slow-operating relay helped to prevent accidents during the construction process.
   慢动作继电器在施工过程中帮助防止事故。
3. 3. The slow-operating relay was designed to improve the accuracy of the measurement system.
   慢动作继电器被设计用来提高测量系统的精度。