He is an expert in analytical mechanics and deeply understands its theory.

He is majoring in electrical engineering.

He is majoring in civil engineering.

I am very interested in natural science.

Statistical mechanics is a branch of physics that provides a theoretical framework for understanding macroscopic phenomena from a microscopic perspective.

Abstract algebra is a branch of mathematics that studies algebraic structures.

Music therapy is very effective in reducing stress.

Astrobiology is a very interesting field of study.

Abstract algebra is a field of mathematics that studies algebraic structures in an abstract way.

He is an expert in geophysics.