?all at once是一個(gè)常用的短語，它可以表示多種含義，具體的意思取決于上下文。一般來說，它可以用作副詞短語或介詞短語，用來描述某件事情發(fā)生的方式或時(shí)間。下面將介紹all at once的不同含義及其使用方式。

1. 同時(shí)地，一起地

這是最常見的使用方式，表示多件事情同時(shí)發(fā)生或同時(shí)進(jìn)行。比如：

- They all arrived at the party all at once. (他們都同時(shí)到達(dá)了聚會(huì)。)

- The lights in the room turned off all at once. (房間里的燈突然全滅了。)

2. 突然地，立刻地

在這種情況下，all at once強(qiáng)調(diào)某件事情突然發(fā)生或立刻發(fā)生。比如：

- All at once, the sky turned dark and it started raining heavily. (天空突然變暗了，并開始下起大雨。)

- She realized all at once that she had forgotten her keys. (她突然意識(shí)到自己忘記帶鑰匙了。)

3. 總而言之，在總體上

在這種情況下，all at once指代總體上的情況或總結(jié)性的表達(dá)。比如：

- The project was a success, but there were some challenges all at once. (這個(gè)項(xiàng)目取得了成功，但也面臨著一些挑戰(zhàn)。)

- The book covers all at once the history, culture and traditions of the country. (這本書總結(jié)了這個(gè)的歷史、文化和傳統(tǒng)。)

4. 一次性地，全部地

在這種情況下，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. (她一口氣吃完了所有的食物。)

- I can't do it all at once, I need more time. (我無法一次性完成，我需要更多時(shí)間。)

5. 全部地，完全地

在這種情況下，all at once強(qiáng)調(diào)某件事情的完整性或全部性。比如：

- The flowers bloomed all at once, creating a beautiful sight. (花朵全部開放了，形成了美麗的景象。)

- She was feeling happy and sad all at once. (她同時(shí)感到快樂和悲傷。)

總的來說，all at once是一個(gè)很靈活的短語，在不同的語境中可以表示不同的含義。因此，在使用時(shí)要根據(jù)具體情況來理解它的意思。

例句參考：

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.