reserve power circuit

例句：

1. 1.The reserve power circuit is crucial for emergency power backup.
   备用电源电路对于紧急电力备份至关重要。
2. 2.The engineers carefully checked the reserve power circuit to ensure it was functioning properly.
   工程师们仔细检查备用电源电路，确保其正常工作。
3. 3. During a power outage, the reserve power circuit is used to provide temporary electricity.
   在停电期间，备用电源电路用于提供临时电力。