A vague notion的用法和样例：
- She had only a vague notion of what might happen.
- While I was finally able to piece enough of the picture together to allow me to take the plunge, I still left with only a vague notion of what to expect.
- A vague or confused state of mind.
- I have a fancy (ie a vague idea) that he will be late.
- She has only a vague idea of that incident.