He understands the importance of learning.

He is majoring in psychology.

Gaku is my best friend.

My child attends a supplementary school every Saturday.

He has a deep interest in parapsychology.

He understands the meaning of the proverb 'Teaching is half learning', which means that teaching leads to one's own learning.

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.