emergency radio

例句：

1. 1. We need to have abackup plan in case of emergencies.
   我们需要一个备用计划以防紧急情况。
2. 2. Theemergency radio was playing loud music when Iarrived.
   我到达时，紧急无线电正在播放大声的音乐。
3. 3. The emergency radio station broadcasted the news about the earthquake.
   紧急无线电台广播了关于地震的消息。