"All at once" 是一个副词短语，意思是“突然地，一下子”。
在英文范文中的应用可能如下：
例句1：I was feeling tired after a long day at work, but all at once, a friend called and asked me to join them for a drink. 我一天工作下来感到很累，但突然间，一个朋友打电话邀请我一起去喝一杯。
例句2：All at once, the doorbell rang. I thought it might be my mother, so I ran to the door. 突然，门铃响了。我想可能是我妈妈，所以我跑去开门。
需要注意的是，“all at once”通常用于表达突然发生的情况或事件，强调事件发生得非常快且出乎意料。
all at once的意思是突然，一下子，同时^[1][2]^。
all at once在句中可作副词短语或名词短语，作名词短语时必须用在名词前面。它表示空间上的同时，是一群人或物同时做某件事，起强调作用。它表示时间上的一致，是突然、同时发生的意思，可连接两个并列的动作^[2]^。
有关all at once的英文范文如下^[3]^：
突然间，他又生气又高兴。It's sudden and he's both angry and happy all at once.
“All at once”的意思是突然，一下子。
关于“All at once”的英文范文：
1. When all of a sudden, the lights went out. All at once, the room was plunged into darkness. 突然间灯灭了，一下子，房间陷入了黑暗。
2. She gasped and then all at once she burst into tears. 她惊呆了，突然间她大哭起来。
3. All at once, he felt a sharp pain in his chest. 突然，他感到胸口一阵剧痛。
4. All at once, the doorbell rang. I knew it was my mother. 突然门铃响了，我知道是我妈妈。
5. All at once, he realized that he had left his keys in the office. 突然间他意识到他把钥匙落在办公室了。
6. All at once, she seemed to change her mind. She didn't seem to want to talk about it anymore. 突然间她好像改变了主意，她似乎不想再谈这件事了。
7. All at once, he felt a sharp pain in his arm. 他的胳膊突然间一阵剧痛。
8. All of a sudden, she started crying. All at once, she seemed to have a lot of things on her mind. 突然间她开始哭了，她好像有很多心事。
以上就是“All at once”的最新变化。