He is an expert in acoustics.

I am majoring in nutrition science at university.

He is majoring in climatology at university.

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

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

He has a deep interest in etymology.

He is an expert in bryology and is studying many types of moss.

Let's eat lunch in the school cafeteria.

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

He is majoring in meteorology at university.