moding circuit

例句：

1. 1. The engineer designed a modulation circuit to improve the signal quality.
   工程师设计了一个调制电路来提高信号质量。
2. 2.In this project, we need to use a modulation circuit to control the power supply.
   在这个项目中，我们需要使用一个调制电路来控制电源。
3. 3. The modulation circuit was responsible for adjusting the frequency of the radio signal.
   调制电路负责调整无线电信号的频率。