演讲者通过声音的抑扬顿挫让故事更加生动。

The speaker made the story more vivid with subtle ___modulations in his voice.

振幅调制常用于广播传输中。

Amplitude ___modulations are commonly used in broadcasting transmissions.

演讲者通过语调的变化来适应不同的听众。

The speaker used vocal ___modulations to adapt to different audiences.