a secret agent的用法和样例：
- A secret agent, an informer, or a spy.
- We soon found out that he was a secret agent.
- Henry Roth, why didn't you tell me you were a secret agent?
- Ben: Hey if our dad was a secret agent I'd idolize him to.
- ALI: When I grow up I want to be a secret agent like Mr. O'Neill.
我长大了以后 我要当密探 就像欧尼尔先生一样.