He is an expert in fiber optics.

He is majoring in electrodynamics at university.

My grandmother is being seen by a specialist in geriatrics.

I am majoring in histology at university.

Kinetics is the study of the motion of objects.

Fiber optics is a part of communication technology.

I am majoring in biophysics at university.

My toxicology textbook is very difficult to understand.

Analytical chemistry is a science for clarifying the components and structure of substances.

My major is mechanical engineering.