He is secretly active as a hentai manga artist.

Euclidean geometry forms the foundation of geometry.

I am majoring in auditory phonetics at university.

Articulatory phonetics is a study about the production of speech sounds.

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

I am majoring in microbiology at university.

He is interested in geometrical shapes.

I studied calculus at university.

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

He is an expert in experimental psychology.