I like learning instrumental music.

He fractured his mandible.

He is an expert in osteology and has a deep knowledge of the human skeleton.

He is an expert in osteology.

He solved the problem in a scientific way.

This reaction occurs through a chemical process.

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.