名词短语
中文翻译：振幅变化信号
同义词：
['amplitude change', 'amplitude variation', 'amplitude modulation']
例句：
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1. The amplitude-change signalling was used to adjust the frequency of the radio waves.
振幅变化信号用于调整无线电波的频率。
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2. The amplitude-change signalling was used to detect the presence of a foreign object in the air.
振幅变化信号用于探测空中的外来物体。
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3.The amplitude-change signalling was used to control the speed of the vehicle.
振幅变化信号用于控制车辆的速度。