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

I studied linear algebra at university.

Palaeoclimatology is the science that studies the past climate of the Earth.

He is an expert in paleobotany.

She has a deep interest in astrology.

He is known as an expert in psychoanalysis.

He is an expert in paleography, and he is good at deciphering ancient handwritten documents.

Riemannian geometry is a field of mathematics that studies geometric objects such as curves and surfaces.

I am majoring in auditory phonetics at university.

Acoustic phonetics is the study of the physical properties of speech.