My great-grandfather was a doctor.

My paternal grandfather once traveled all over Japan when he was young.

He has expert knowledge.

He is studying computer science at a specialized school.

He is a specialist fool, with no interest in anything outside his field.

He couldn't say anything about issues outside of his field of expertise.

There are many different specialty stores in this town.

Mr. Fujiike is my best friend.

Mr. Ikematsu is my best friend.

I want to learn about the history of Chouchi.