savant       
noun [ C ]  formal uk/ˈsæv.ənt/ us/sævˈɑːnt/
 (尤指在其他方面缺乏能力的)博学之士,学者,专家
a person with a high level of knowledge or skill, especially someone who is less able in other ways
  There are musical savants who are very awkward physically - until they sit at the piano. 有些音乐专家平时举止显得不自然,但一旦坐在钢琴面前就大不一样。