in a heartbeat片語KK [ɪn ə ˋhɑrtˏbit] /ɪn ə ˈhɑɹtˌbit/發音片語1毫不猶豫、立刻、馬上口語If they offered me that job, I would take it in a heartbeat.如果他們給我那份工作,我會毫不猶豫地接受。2一瞬間、轉眼間Everything can change in a heartbeat after one phone call.一通電話之後,一切都可能在一瞬間改變。