spare transformator

例句：

1. 1. The spare transformator was used to power the emergency lights during the power outage.
   备用变压器在停电期间用于为紧急照明供电。
2. 2. The company had invested in a spare transformator to ensure continuous power supply during emergencies.
   该公司投资了一台备用变压器，以确保在紧急情况下持续供电。
3. 3. The spare transformator was installed in the generator room to provide backup power in case of a breakdown.
   备用变压器安装在发电机房内，以备发生故障时提供备用电源。