With an amplifying device like a microphone, the speaker can use a natural tone.
有了麦克风之类的扩音装置，演讲者就可以使用自然的音调。
Low cost high-frequency device, high-frequency amplifying method, radio communication device and mobile phone.
低成本高频装置，高频放大方法，无线通信装置和移动电话。
An amplifying type (or analog) device, as opposed to digital device.
放大器类(或模拟)器件，相对于数字器件而言的。
An amplifying type (or analog) device, as opposed to digital device.
放大器类(或模拟)器件，相对于数字器件而言的。
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