in no time,right away, right now, at once 有何差别,细讲_百度知 ...答:at once,in no time,right now,right away 这四个短语常可互换,只是说话角度上有细微区别.1.at once等于now,without delay.如:Do it at once.立刻就做.Come here at once!马上就来!at once 也有“at the same time,together”的意思.如:Don’t all speak at once!不要全体同时说话!注意...