华盛顿(CNN)——由美国执法部门、广播部门和交通部门使用的儿童绑架警报系统现在已经在Facebook上线。
Washington (CNN) — The child-abduction alert system used by law enforcement, broadcasters and transportation departments is now available on Facebook.
公共广播系统在美国的商场，机场，和杂货店普遍使用。
PB systems are commonly used in American malls, airports and grocery stores.
本文介绍了一种用数字方式实现美国数字电视地面广播系统中的8VSB调制器的方法。
This paper describes the realization of ATSC 8-VSB Modulator of the VSB-based HDTV terrestrial broadcasting system by using almost all digital methods.
公共广播系统在美国的商场、机场、和杂货店普遍使用。
Public Address systems (PA systems) are commonly used in American malls, airports and grocery stores.
麦考利夫的家人反应美国宇航局上的一个公共广播系统，其次是快速故障爆炸警告。
McAuliffe's family reacts to a malfunction warning on the NASA public address system which was followed quickly by the explosion.
麦考利夫的家人反应美国宇航局上的一个公共广播系统，其次是快速故障爆炸警告。
McAuliffe's family reacts to a malfunction warning on the NASA public address system which was followed quickly by the explosion.
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