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1.The engineer used a modulation method to adjust the frequency of the signal.
工程师使用一种调制方法来调整信号的频率。
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2. In radio communication, modulation is the process of converting electrical signals into sound waves.
在无线电通信中，调制是将电信号转换为声波的过程。
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3.The scientist discovered a new modulation method that could increase data transmission efficiency.
科学家发现了一种新的调制方法，可以提高数据传输效率。