Public Address systems (PA systems) are commonly used in American malls, airports and grocery stores.

公共广播系统在美国的商场、机场、和杂货店普遍使用。

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Inside, it's typical party-bus fare, with LCD screens, DVD players and PA systems, along with all the required safety gear.

内，这是典型的党的巴士票价，与液晶显示屏， DVD播放机和扩音系统，以及所有必要的安全装置。

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Combo amplifiers for bass, guitars, keyboards, electronic drums and PA systems. Please reply with full specifications, pictures.

求购用于贝斯，吉他，键盘，电子鼓，扩音系统的组合放大器。请回复详细规格和图片。

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Across the land, collections are being taken for those who have lost everything, vans with PA systems driving around calling on people to give what they can.

CNN: Tsunami tragedy: Your e-mails

Just since the 2010 peace talks (and right on up to this month), there has been a continuous, venomous stream of hate messages disseminated by the PA through its media and social and education systems.

FORBES: My Family In Israel: One Direct Hit, Two Near Misses -- And The Brainwashing Behind The Rockets