电话机包括一个送话器和一个受话器，用来在模拟语音和模拟电信号之间进行变换。
The telephone contains a transmitter and receiver for converting back and forth between analog voice and analog (voice-frequency) electrical signals.
它是随着电话的发明而出现的，当时主要用于电话通讯的受话器中。
It is the invention as the telephone appeared, which was mainly used for telephone communications in the receiver.
它是随着电话的发明而出现的，当时主要用于电话通讯的受话器中。
It is the invention as the telephone appeared, which was mainly used for telephone communications in the receiver.
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