all at once
参考词典中all at once的常规释义：
基本释义
- adv. 突然；同时
英英解释
2个副词解释
- all at the same time
[同] all at once, all together
[例]- Let's say Yes!' all at once
- without warning
[同] all at once, all of a sudden
[例]- all at once, he started shouting
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