He earned a doctorate in the field of applied science.

He is majoring in Sinology at university.

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Serology plays a very important role in the diagnosis of infectious diseases.

He is an expert in serology, working on research into infectious diseases.

He has a deep interest in geomancy.

Stoichiometry is a method for calculating the amount of substances in a chemical reaction.

Thermochemistry is a part of chemistry that deals with the reactions of heat and matter.

Thermochemistry is a branch of chemistry that studies the interaction of heat and matter.

He is majoring in logic.