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。

youdao

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。

youdao