名詞 false alarm:

1. a warning that is given about something that fails to occur

1. Martin said the boss was going to make a surprise visit, but it proved to be a false alarm.
   馬丁說老板將來個突然造訪，但結果卻是虛驚一場。
2. The sky went very dark and we thought it was going to rain but it was a false alarm.
   天空變得黑沉沉的，我們以為要下雨了，但結果只是虛驚一場。
3. The troops (were) stood down: it was a false alarm.
   部隊解除了戒備狀態(tài)，原來是虛驚一場。
4. The rumours of a petrol shortage turned out to be a false alarm.
   汽油短缺的謠傳原來是一場虛驚。