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.
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。
Dynamic configuration: reasonable power, superior performance of diesel engine, provides a powerful source of construction work reliability of the power, fuel economy, got a boost.
动力配置：合理功率，性能优越的柴油机，为施工作业提供了强大的动力源泉，动力的可靠性，燃油的经济性，得到了大幅提升。
Dynamic configuration: reasonable power, superior performance of diesel engine, provides a powerful source of construction work reliability of the power, fuel economy, got a boost.
动力配置：合理功率，性能优越的柴油机，为施工作业提供了强大的动力源泉，动力的可靠性，燃油的经济性，得到了大幅提升。
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