public address system 是什么意思

an electronic amplification system used as a communication system in public areas
同义词：P.A. system, PA system, P.A., PA,

	1.	Volume controllers are useful in public address systems 公共广播系统的音量控制器很有用。
	2.	Public address system with zone control 公共广播系统包括区域控制
	3.	I hear they ' re announcing my flight over the public address system 我听到扩音器在播我的班机信息了。
	4.	I hear they are announcing my flight over the public address system 我听到扩音器在播我的班机信息了。
	5.	Acoustic feedback is a common phenomenon in public addressing systems 声反馈,是扩声系统中的一种常见现象。
	6.	Pas : public address system 公共广播音响系统
	7.	Pas public address system 扩声系统
	8.	Pas public address system 扩声系统
	9.	Pc public address system 扩声系统
	10.	Charge for the use of self - operated public address system not exceeding 2 hours 租用可由使用者自行操作的扩音设备收费不逾2小时

public address system是什么意思