all at once是什么意思？

all at once是一个常用的短语，它可以表示多种含义，具体的意思取决于上下文。一般来说，它可以用作副词短语或介词短语，用来描述某件事情发生的方式或时间。下面将介绍all at once的不同含义及其使用方式。

1. 同时地，一起地

这是最常见的使用方式，表示多件事情同时发生或同时进行。比如：

- They all arrived at the party all at once. (他们都同时到达了聚会。)

- The lights in the room turned off all at once. (房间里的灯突然全灭了。)

2. 突然地，立刻地

在这种情况下，all at once强调某件事情突然发生或立刻发生。比如：

- All at once, the sky turned dark and it started raining heavily. (天空突然变暗了，并开始下起大雨。)

- She realized all at once that she had forgotten her keys. (她突然意识到自己忘记带钥匙了。)

3. 总而言之，在总体上

在这种情况下，all at once指代总体上的情况或总结性的表达。比如：

- The project was a success, but there were some challenges all at once. (这个项目取得了成功，但也面临着一些挑战。)

- The book covers all at once the history, culture and traditions of the country. (这本书总结了这个的历史、文化和传统。)

4. 一次性地，全部地

在这种情况下，all at once指代一次性完成某件事情或全部做完某件事情。比如：

- She ate all her food all at once. (她一口气吃完了所有的食物。)

- I can't do it all at once, I need more time. (我无法一次性完成，我需要更多时间。)

5. 全部地，完全地

在这种情况下，all at once强调某件事情的完整性或全部性。比如：

- The flowers bloomed all at once, creating a beautiful sight. (花朵全部开放了，形成了美丽的景象。)

- She was feeling happy and sad all at once. (她同时感到快乐和悲伤。)

总的来说，all at once是一个很灵活的短语，在不同的语境中可以表示不同的含义。因此，在使用时要根据具体情况来理解它的意思。

例句参考：

1. All at once, the children started crying and screaming.

2. He received a promotion, a raise and a new office all at once.

3. The movie was funny, sad and thought-provoking all at once.

4. She realized all at once that she had made a big mistake.

5. The music suddenly sped all at once, leaving the room in silence.