all at once与all of a sudden有何区别

问题描述:

all at once与all of a sudden有何区别
能够举例给与说明吗?

all at once和all of a sudden均有“突然”的意思,不过前者还有同时的意思.如:When I asked a question,he put up his hand all at once.(我一提问,她立刻就举起手) When I asked a question,she shouted all of a ...