All at once there was someone knocking on the door.
忽然有人敲門(mén)。
She wanted to laugh and weep all at once
她哭笑不得。
I feel terribly sleepy all at once
我突然覺(jué)得特別困。
In the hot sun the rain-washed herbs smelled sharp and spicy and sweet all at once.
烈日下,被雨水沖刷過(guò)的香草聞起來(lái)既沖又香氣撲鼻。
All at once I fell into a state of profound melancholy.
我立即陷入無(wú)限的愁思之中。