precocious
adjective uk/prɪˈkəʊ.ʃəs/ us/prəˈkoʊ.ʃəs/
（尤指儿童）智力超常的，早熟的
(especially of children) showing mental development or achievement much earlier than usual
A precocious child, she went to university at the age of 15. 她智力超常，15岁就上了大学。
She recorded her first CD at the precocious age of twelve. 她在12岁这么小的年纪就录制了自己的第一张激光唱片。
disapproving少年老成的
A precocious child behaves as if they are much older than they are.
a precocious little brat 很老练的小家伙