all at once

基本解释

All at once I tumbled to what he meant.
我突然明白了他的意思。
http://dict.hjenglish.com
He thought of the coffin, and it hit him all at once—the dark and the stupid helplessness he felt.
他想到了棺材，他突然生出如被雷击的感觉—仿佛被黑暗和愚蠢的无助感淹没了一样。
Hence it should be noted that, in conquering a state, its conqueror should weigh all the injurious things he must do and commit them all at once, so as not to have to repeat them every day.
因此，应该指出，在征服一个国家的过程中，它的征服者应该把所有他必须做的对臣民有害的事情都集中在一起然后一劳永逸的把它们都做了，以免不得不每日再重复它们。

All at once, the Confederate artillery thundered with a deafening roar.
bugs And if so, let's fix them all at once rather than one at a time.
让我们一次性全部修复这些,而不是一次修复一个。
麻省理工公开课 - 计算机科学及编程导论课程节选
People can't pay that, if they're in any trouble, they can't come up with the whole value of the loan all at once.
如果人们遇到困难,将无法一次性凑齐这笔大额款项
耶鲁公开课 - 金融市场课程节选

IMF, which will pay out in stages, not all at once, would not be amused.
ECONOMIST: Fresh IMF money may save the economy, at a high social cost