The mathematician is an impractical person who can't even boil an egg.那位数学家是个什么事都不会做的人，连煮蛋都不会。I'm not a very good mathematician.我不太擅长计算。This untutored mathematician had an obsession with numbers.这位非科班出身的数学家对数字特别痴迷。He was a mathematician, as I recall.我记得他是一位数学家。