secondary controller

例句：

1. 1. The secondary controller is responsible for monitoringthe system's performance.
   次要控制器负责监控系统的性能。
2. 2. The secondary controller was designedto improve the system's efficiency.
   次要控制器被设计来提高系统的效率。
3. 3. Thesecondary controller was used to control the temperaturein the room.
   次要控制器用于控制房间的温度。