reserve power supply

例句：

1. 1.The company reserves power supplies for emergency situations.
   该公司为紧急情况预留了电力供应。
2. 2.The power plant is equipped with a reserve power supply system.
   该电厂配备了备用电源系统。
3. 3.To ensure the smooth operation of the electrical grid, the government has reserved power supplies for critical areas.
   为了确保电网的平稳运行，政府已为关键区域预留了电力供应。