His specialty is physics.

My house is near the mountains.

He is researching about a new energy source.

He is conducting research on a new energy source.

He is known as a person with learning.

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

There are many different specialty stores in this town.

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

She is planning a date with her current boyfriend.

He lost everything.