a childish prank的用法和样例：
- But the school board let them off with a suspension, arguing that the incident was just a childish prank.
- Slapping his face was a childish act.
- A childish idea like that can be amusedly tolerated.
- You would be laughed out of court with such a childish question.
- The vocal part of this song is sung in a childish voice.