auxiliary power unit

例句：

1. 1. The auxiliary power unit is responsible for providing backup power during emergencies.
   辅助动力单元在紧急情况下负责提供备用电源。
2. 2.The auxiliary power unit was designed to operate independently of the main power source.
   辅助动力单元被设计为与主要电源源独立操作。
3. 3. The auxiliary power unit was used to power the lights and other electronic devices in the room.
   辅助动力单元用于给房间内的灯和其他电子设备供电。