He is majoring in silviculture.

He is an expert in speleology and is exploring caves around the world.

He went to the UK for a study tour.

He went to America to study abroad.

Geology is a study that elucidates the history of the Earth.

I am very interested in genetics.

He is majoring in meteorology at university.

I specialize in pharmacology research.

She is suffering from temporomandibular joint disorder.

Chromodynamics is a part of particle physics that describes strong interactions.