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

He is studying thermodynamics in depth.

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

Quantum mechanics is a branch of physics that studies the behavior of microscopic particles.

He is an expert in electrodynamics.

Chromodynamics is a part of particle physics that describes strong interactions.

He likes to take a walk in the park at dusk.

Quantum chromodynamics is a part of particle physics that describes strong interactions.

The philosophy of Mohism, one of the thoughts of ancient China, advocated universal love and fairness.

He fulfilled his responsibilities as a government official.