He is a world-renowned osteologist.

My major is mechanical engineering.

Cartography is an important field of study for visually representing geographic information.

Topography is a field of study that researches terrain and geographical features.

Earth science is a part of natural science that studies the physical and chemical structure of the earth.

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.