a private citizen的用法和样例：
- I don't perspire.I am a private citizen, yet I receive fan mail.
- The once and future Defense secretary, at the time a private citizen, had been sent by President Ronald Reagan to Baghdad as a special envoy.
- A private citizen is required by law to arrest anyone committing a felony in his sight.
- In recent days, the president has said he is ready to return to Texas and life as a private citizen.