起初它被发明出来用于无线电信号的放大，这让你能够用晶体管收音机取代真空管收音机。

It was first developed to amplify radio signals, and you had transistor radios that replaced the vacuum tubes that were being used.

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顾名思义，晶体管常用作混频器，可以输出混频信号，并且是许多电子通讯系统的基本元件。

As the name suggests, mixers produce output signals with mixed frequencies and are fundamental components of many electronic communications systems.

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我们正在使用这种晶体管来放大电话信号。

We are using this transistor to amplify a telephone signal.

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