power variation rate

例句：

1. 1. The power variation rate of the system is 5% per hour.
   系统的功率变化率为每小时5%。
2. 2. The power variation rate is a critical factor in determining the efficiency of the system.
   功率变化率是决定系统效率的关键因素。
3. 3. The power variation rate can be used to monitor the performance of the system over time.
   功率变化率可以用来监测系统随时间的性能表现。