public address set

例句：

1. 1.The public address system was not working properly.
   公共广播系统工作不正常。
2. 2. The engineer had to set the public address system for the meeting.
   工程师必须为会议设置公共广播系统。
3. 3.The public address system is used to broadcast announcements to the audience.
   公共广播系统用于向观众广播公告。