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。

youdao

Numerical simulation of pollutants' diffusion in air has been adopted widely, but the false diffusion occurring in simulation is always an important factor affecting the accuracy of the results.

用数值模拟的方法预测污染物在大气中的扩散已经被广泛采用，但数值模拟产生的伪扩散一直是影响模拟结果精度的重要因素。

youdao

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。

youdao

Automatic messages sent by the Airbus 330's computers showed it was receiving false air-speed readings from its sensors.

BBC: Air France crash: Tail section found on Atlantic seabed

Reports that Saddam had been killed in early air raids seemed false, but doubts were raised about the authenticity of television appearances of characteristic defiance.

ECONOMIST: One week on

But I think that there may be a false perception that there are a whole bunch of secret super-effective air assets that are in a warehouse somewhere that could just be pulled out and that would somehow immediately solve the situation in Libya.

WHITEHOUSE: President Obama & Prime Minister Cameron Joint Press Availability | The White House