He has a deep interest in archaeology.

He understands the importance of learning.

He is majoring in psychology.

Gaku is my best friend.

My child attends a supplementary school every Saturday.

I am majoring in physical chemistry at university.

I am majoring in biophysics at university.

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.