单词：modulation signal
modulation signal的用法和样例：
例句
- The group velocity is the speed at which modulated signals would be transmitted.群速度就是将调制信号发送出去的速度。
- In the picture above you can see a modulated signal driving the IR LED of the transmitter on the left side.上面图片中你可以看到一个调制信号驱动红外发光二极管的发射器的左边。
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