a nasty puzzle

• 难以解决的疑团

a nasty puzzle的用法和样例：

例句

1. A nasty puzzle; a nasty problem.
   难以解决的疑团; 难以解决的问题
2. The dog gave me a nasty nip on the leg.
   那狗在我腿上狠咬了一口。
3. He is a person with a nasty mind.
   他是个思想肮脏的人。
4. He gave his back a nasty jar when he fell.
   他这一跌，背部　得很厉害。
5. She fell off her bike and got a nasty knock.
   她从自行车上摔下来，摔得很重。
6. This presented a nasty problem to the new governor.
   这成了新州长的一个棘手的问题。