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public-address systems

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un.有线广播系统；机上广播系统；扩音系统

复数：public-address systems

public-address systems

public-address systems

public-address systems

1

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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