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.

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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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使用肩部来固定收话器，扬声器电话或头戴送受话器。

Use a shoulder rest receiver, speaker phone, or headset.

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使用肩部来固定收话器，扬声器电话或头戴送受话器。

Use a shoulder rest receiver, speaker phone, or headset.

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