He is an expert in astrophysics, and his research is highly valued around the world.

He is an expert in applied physics.

He solved the problem in a scientific way.

This reaction occurs through a chemical process.

He has a deep interest in geomancy.

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.

I saw many animals at the zoo.