at once
/æt wʌns/ 133without delay or hesitation; with no time intervening; "he answered immediately" "found an answer straightaway"
noun [抽象名词]立刻,马上:表示需要立即采取行动或完成某事。
He took off at once and headed back to the motel. 他立刻离开,回到汽车旅馆。
单词造句:
He took off at once and headed back to the motel. 他立刻离开,回到汽车旅馆。