Asei is my elder brother.

Maybe because of lack of sleep, my head feels fuzzy.

He is a student at the University of Tokyo.

Phonetics is a part of linguistics that studies the physical, physiological, and psychological aspects of sounds.

Geopolitics is the key to understanding important aspects of international relations.

He is good at performing opera.

My company specializes in the manufacture of fine chemicals.

He is an expert in toxicology.

He is an expert in orthoepy, teaching pronunciation.

He is an expert in planetary science.