My younger brother will enter the engineering department next year.

He is a world-famous mathematician.

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

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.

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