He participated in the anti-war movement.

I look forward to playing beach volleyball with my friends during the summer vacation.

My great-grandfather was a leading painter in Japan when he was young.

Heavy hydrogen is one of the isotopes of hydrogen.

In linear algebra, the upper triangular matrix plays a very important role.

The grammar of 'Jou-nidan' is an important part in learning Japanese.

My room is on the upper level.

He has fundamental knowledge of mathematics.

Carbon monoxide is a colorless, odorless gas, and it is dangerous to inhale.

I am majoring in histology at university.