PA system 公共广播系统 ; 扩音系统 ; 软件测试实习生
the grade of PA system 公共广播系统的等级 ; 系统的等级
PA System Rental 音响系统
Welsaiar PA SYSTEM 德国威赛尔硬地丙烯酸
PA system public address system 公共播音系统
Outdoor PA System 室外扩音器
PA system standards 扩声特性指标
In lieu of an alarm clock, sleeping crews are woken by music played over the PA system by Nasa staff on the ground.
代替闹钟唤醒宇航员的是由地面上的NASA工作人员通过PA系统播放的音乐。
Often they were outdoor shows, sometimes with no PA system at all, so I really had to learn how to project to be heard.
演出一般都是露天的，有时候甚至没有扩音装置，所以我必须学会在各种条件下让声音传到观众耳朵里。
WE WERE just settling down for our flight when the captain's voice came over the PA system.
我们刚刚在飞机上坐好，扩音器中突然传来机长的声音。
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