a whiff of fragrance的用法和样例：
- I caught a whiff of perfume as she swept past me.
- A whiff of ether will put you out in a few seconds.
- Something good must be cooking; I get a whiff of it.
- A whiff of gas will quickly put you off.
- The rooms in this hotel savour of a whiff of roach.
- A whiff of fresh air cleared his head.