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

He is an expert in aerodynamics.

Understanding dynamical systems is an important part of physics.

He is an expert in classical mechanics.

Newtonian mechanics is one of the fundamental theories of physics.

He is writing a thesis on celestial mechanics.

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

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

He thoroughly researched the history of that nation.

He is a famous composer.