突然的英语短语3个词是all at once.
all：pron. 所有; 全部; 全体; 一切; 唯一的事物; 所有的事物。
once：adv. 曾经; 曾; 一次; 仅一次; (用于否定句、疑问句和if后)曾，根本。
扩展资料
All at once there was someone knocking on the door.
忽然有人敲门。
She wanted to laugh and weep all at once
她哭笑不得。
I feel terribly sleepy all at once
我突然觉得特别困。
In the hot sun the rain-washed herbs smelled sharp and spicy and sweet all at once.
烈日下，被雨水冲刷过的香草闻起来既冲又香气扑鼻。
All at once I fell into a state of profound melancholy.
我立即陷入无限的愁思之中。
