The fire service was called out but it was a false alarm.

消防人员接到报警后出动，但这是假报火警。

《牛津高阶英汉双解词典》

But on some level, this is a false alarm.

但是在某些程度上, 这是个假警报.

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Just a false alarm probably, I told myself.

应该是虚惊一场吧.我内心暗忖.

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The rumours of a petrol shortage turned out to be a false alarm.

汽油短缺的谣传原来是一场虚惊.

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