He is an expert in volcanology, studying volcanoes around the world.

He has a deep interest in archaeology.

I have to pay my tuition by next month.

The educational system in Japan consists of six years of elementary school, three years of junior high school, three years of high school, and four years of university.

He quit his job temporarily to devote himself to his school studies.

He spends a lot of time on research activities outside the school.

He is an erudite person who can talk about any topic.

He is the most respected in the class because of his erudition.

Understanding chemical equations is difficult.

Understanding chemical equilibrium is very important in understanding chemical reactions.