in an instant   (TTS發音)

immediately； very soon立即；立刻

    The operator touched the key，and in an instant the message was at its destination. 話務員一按鍵，信息立即就到達目的地了。

    The mother told her child to stay in the room， saying that she would be back in an instant.母親叫孩子留 在房間裡，說她馬上就會回來的。

    He heard the news and started off in an instant. 他聽到消息立刻動 身。