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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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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Rupert Chapman, an IT risk management consultant at PA Consulting, said: "They've found that the systems were not up for the job and there is a real case for change."

PA Consulting的IT风险管理顾问鲁珀特•查普曼表示：“他们发现这些系统无法胜任工作，确实需要改变。”

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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.

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