a precocious child的用法和样例：
- His son is a precocious child who could play the piano at the age of three.
- She spoke as though she were talking to a precocious child.
- The TX-SR875 seems to have been styled by committee, or by a precocious child with a setsquare.
- a precocious child; a precocious achievement.
- a precocious child who started her acting career at the age of 5
- Childhood hardships matured in him a precocious sense of responsibility.