In the old days, people prayed to the gods to plant rice.

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.

He is my veteran, and he taught me many things.

Regardless of the size of the problem, we need to solve it.

Boolean algebra is the foundation of logic and computer science.

He is a veteran to me, with a lot of experience and knowledge.