He is really a 'cool' person.

Mr. Okuda is an insurance sales representative.

She brought up her child alone.

My younger brother is attending a middle education school.

There are a few problems.

Let's calculate so that all numbers become equal.

The bird is making a nest in the tree.

He works at the Ministry of Health, Labour and Welfare.

He is a very quiet person.

Special relativity is one of the fundamental theories of physics.