I am majoring in nutrition science at university.

He is majoring in climatology at university.

He is an expert in limnology, and his research is highly regarded worldwide.

Demography is a part of social science that studies the structure, evolution, and problems of human population.

He is an expert in ornithology, studying types of birds all over the world.

He has a deep interest in etymology.

Do you remember where I put my study guide?

He is an expert in Classical Chinese text studies, and is good at interpreting ancient Chinese literature.

He understands the basic concepts of thermodynamics.

Spectroscopy is an important means of investigating the properties of matter.