He is deeply interested in the theory of ethnic socialism.

We should always remember the power of Kannon in difficult times.

He is an expert in ornithology, studying types of birds all over the world.

He is an expert in speleology and is exploring caves around the world.

He is majoring in meteorology at university.

He is passionate about his research in futurology.

He is majoring in analysis at university.

Let's eat lunch in the school cafeteria.

He is known as an expert in gerontology.

He is an expert in acoustics.