a person-to-person call的用法和样例：
- I'm afraid it must be a person to person call.
- I need to make a person to person call.
- If it is collect call, I'm afraid it must be a person to person call,not a station to station call.
- Operator, I want to make a person to person call to Mr. Johnson of the Asia Trading company in Hong Kong.
- He will flatter a person to his face, and then rundown behind his back.