a person who concentrates primarily on a particular subject or activity; a person highly skilled in a specific and restricted field 专家 ■a person highly trained in a particular branch of medicine 专家;专科医生
adjective
possessing or involving detailed knowledge or study of a restricted topic 专业的 the project may involve people with specialist knowledge. 这项计划可能要有专业知识的人参与。 ■[attrib.]concentrating on a restricted field, market, or area of activity 专门的 a specialist electrical shop. 一家电器专卖店。