He understands the importance of learning.

He is majoring in psychology.

Gaku is my best friend.

He is interested in phrenology.

He is interested in ancient mathematics.

I am majoring in parasitology at university.

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

He is majoring in metallurgy at university.

He learned about the structure of society in his civics class.

He is an expert in enzymology and conducts many researches.