a problem play的用法和样例：
- Heavy traffic poses a problem in many old towns.
- We are facing a problem of great complexity.
- I still wouldn't have a problem playing for him again because he was such a big influence on my career and he was a father figure to me.
- Call it what you will, it's still a problem.
- You should not always sleep on a problem.
- You should not always sleep upon a problem.