a cheeky grin的用法和样例：
- The scruffy boy with a cheeky grin is staring at me.
- What a cheeky little miss she is!
- He added with a wink and cheeky grin, however, that he had plenty given to him as "gifts".
- "I'm just getting a drink,"I said. The barman's cheeky grin suggested he was enjoying serving a group of young ladies.
- The barman's cheeky grin suggested he was enjoying serving a group of young ladies.