N-COUNT
独通一行的人;独开一窍的人;天才型弱智者
You can refer to someone as an idiot savant if they seem to be less intelligent than normal people but are unusually good at doing one particular thing.
例句
...an idiot savant, an autistic with a gift for numbers.
对数字独具禀赋的天才型自闭症患者