He is majoring in metallurgy at university.

He is an expert in rhetoric, teaching the techniques of speech.

He is majoring in Japanology at university.

He is globally recognized as an expert in Indology.

He is reading a book about demonology.

He is an expert in oceanography.

He learned about the structure of society in his civics class.

He is an expert in enzymology and conducts many researches.

He is an expert in gemology, and he is good at evaluating the quality of diamonds.

Eugenics is the science of improving human genetic qualities.