N-COUNT
獨通一行的人;獨開一竅的人;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.
對數字獨具稟賦的天才型自閉癥患者