all at once片语KK [ɔl æt wʌns] /ɔl æt wʌns/发音片语1突然、忽然、猛然All at once the lights went out and everyone fell silent.突然灯全灭了,大家都安静下来。2同时、一起Please don't all speak at once; I can't handle so many questions all at once.请不要一起讲话,我没办法同时应付这么多问题。用这个字练口说→