battery backup的用法和样例：
例句
- Three-phase UPS systems are used in most large data centers for power conditioning and battery back-up in the event of mains power failure.
当数据中心一旦发生主电源掉电的时候，三相不间断电源系统是应用最广泛的后备电池和供电条件。 - Switch between working battery and spare battery is fulfilled by using magnetic latching relay.This method effectively lowers the power dissipation.
后备电池的切换采用磁保持继电器，有效地解决了在线侦测和低功耗的技术难点。
词汇搭配
- back up (因积聚而)拥堵...
