He is an expert in psychiatry.

He has a deep interest in etymology.

I bought a new study aid for my math exam.

He is an expert in applied physics.

My sister works as a physical therapist.

He is an expert in Classical Chinese text studies, and is good at interpreting ancient Chinese literature.

Proletarian literature is a type of literature that depicts the life and struggles of the working class.

Spectroscopy is an important means of investigating the properties of matter.

Gestalt psychology is an important means to understand human cognitive processes.

This baked skewered tofu in miso sauce has a very good flavor.