B1 quickly and unexpectedly突然；猛地，骤然
"Do you remember much about the accident?" "No, it all happened so suddenly." “你还记得事故是怎么回事吗？”“不记得了，事情发生得太突然了。”
I suddenly realized what I'd said, but it was too late. 我突然意识到秃自己说什么，不过为时已晚。
- The door suddenly flew open.
- Rosie suddenly grasped my hand.
- I was woken up suddenly by the sound of someone hammering on the front door.
- He suddenly appeared in the doorway.
- I suddenly became aware of him looking at me.