back up oscillator

例句：

1. 1.The back-up oscillator in the computer system is essential for powering down the main unit when it fails.
   计算机系统中的备用振荡器对于在主单元失败时关闭它至关重要。
2. 2. The engineer used a back-up oscillator to test the new circuitry.
   工程师使用备用振荡器来测试新的电路。
3. 3. The backup oscillator was crucial during the emergency power outage, ensuring that the hospital remained operational.
   在紧急停电期间，备用振荡器至关重要，确保医院能够继续运营。