false alarm

1.

Martin said the boss was going to make a surprise visit, but it proved to be a false alarm.

马丁说老板将来个突然造访，但结果却是虚惊一场。

2.

The sky went very dark and we thought it was going to rain but it was a false alarm.

天空变得黑沉沉的，我们以为要下雨了，但结果只是虚惊一场。

3.

The troops (were) stood down: it was a false alarm.

部队解除了戒备状态，原来是虚惊一场。

4.

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。