The final movement of his piano concerto was very moving.

I am interested in Dutch studies.

He is majoring in philosophy.

I am majoring in psychology.

Geography is my favorite subject.

He is an expert in volcanology, studying volcanoes around the world.

He is a world-renowned agronomist.

What is the difference in price between these two products?

He is an expert in biochemistry.

The use of chemical weapons is prohibited by international law.