电报机与电话机等设备，通过产生调制电脉冲或以系统化方式变化的脉冲，来传递信息。
Devices such as the telegraph and telephone relay messages by creating modulated electrical impulses, or impulses that change in a systematic way.
电报机与电话机等设备，通过产生调制电脉冲或以系统化方式变化的脉冲，来传递信息。
Devices such as the telegraph and telephone relay messages by creating modulated electrical impulses, or impulses that change in a systematic way.
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