音响呼叫
... audible busy signal 音响占线信号 audible call 音响呼叫 audible frequency 音频,声频,可听频率 ...
本阶段可使用扩音喊话系统。
Fire emergency: in case of a fire, please call the hotel operator, the emergency alarm system will give out audible warning. If you have hearing.火灾:在遇到火灾的时候,请打电话联系电话总机,紧急情况警铃会自动响起。