汽车、火车、舰船鸣笛，防空警报鸣响。
防空警报响起时，大家都快速进了防空洞。
Everybody quickly went to the bomb shelter when the alert sounded.
国家用于人民防空通信的专用频率和防空警报音响信号，任何组织或者个人不得占用、混同。
No organizations or individuals may use the same frequency or the same acoustic signals as those specially used by the State for civil air defense communications or air defense warning.
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