因此，我们需要某些形式的功率放大器(PA)来提高来自信号源的信号功率，使其足以播放音乐。

Hence we will require some form of power Amplifier (PA) to "boost" the signal power level from the source and make it big enough to play the music.

youdao

因此，我们需要某些形式的功率放大器(PA)来提高来自信号源的信号功率，使其足以播放音乐。

Hence we will require some form of power Amplifier (PA) to "boost" the signal power level from the source and make it big enough to play the music.

youdao