a nasty person的用法和样例：
- He's a nasty person,he'll never hesitate to do other people down.
- He is a person with a nasty mind.
- The dog gave me a nasty nip on the leg.
- He gave his back a nasty jar when he fell.
- She fell off her bike and got a nasty knock.
- This presented a nasty problem to the new governor.