America is one of the superpowers in the world.

The theory of harmonic oscillators is a fundamental concept in physics.

My hometown is Fukuoka City, the prefectural capital of Fukuoka Prefecture.

I study Japanese every day using a workbook.

He wakes up early in the morning.

Please stop deriding my dreams.

Wataru is the main character of this story.

The climate changes are intense, aren't they?

She had a beautiful headdress on her head.

This book is very thick.