drop of frequency

例句：

1. 1. The dropof frequency is measured by the change involtage across a resistor.
   频率的滴落通过电阻两端电压的变化来测量。
2. 2.The drop of frequency can be caused bychanges in temperature or pressure.
   频率的滴落可以由温度或压力的变化引起。
3. 3.The drop of frequency is often used todescribe the decrease in signal strength over time.
   频率的滴落通常用来描述信号强度随时间减少的情况。