all at once
例子
The lights went out all at once, leaving the room in darkness.
灯一下子全灭了，房间陷入黑暗。
All at once, the crowd began cheering as the band took the stage.
突然，当乐队登上舞台时，人群开始欢呼。
例子
The children started talking all at once, making it hard to hear anyone.
孩子们一下子都开始说话，让人很难听清任何人的话。
The lights went out all at once, plunging the room into darkness.
灯一下子全灭了，房间陷入了黑暗。
