precocious

1. ADJ A precocious child is very clever, mature, or good at something, often in a way that you usually only expect to find in an adult. 早熟的

Margaret was always a precocious child. 玛格丽特一直是个早熟的孩子。

She burst on to the world tennis scene as a precocious 14-year-old. 她作为一个14岁的早熟孩子突然出现在了世界网坛上。