All the air raid warnings, without exception, had been false alarm.
所有空袭预告——毫无例外——都是虚假警报。
Traditional method to assess risk for optical imaging reconnaissance satellite is satellite-on-air forecast, and it is simple to operate but has false alarm.
传统评估光学成像侦察卫星的威胁一般是采用卫星临空预报方式，这种方式虽然操作简单，但是必然存在一些虚警现象。
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