Bell arrived at the conclusion that to carry the human voice he would have to create a continuous current of electricity that would vibrate with the tones of the voice.
贝尔得出结论，要传达人的说话声，他必须产生出能随说话声的音调一起震荡的连续电流。
Bell arrived at the conclusion that to carry the human voice he would have to create a continuous current of electricity that would vibrate with the tones of the voice.
贝尔得出结论，要传达人的说话声，他必须产生出能随说话声的音调一起震荡的连续电流。
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