This book is a thousand yen.

There are a thousand meters from my house to school.

Mr./Ms. Sen is my best friend.

A journey of a thousand miles begins with a single step.

Understanding numbers is important for solving math problems.

He was bedridden with illness for several days.

I can't solve this problem because there are too many numbers.

I ate one apple.

I ate one apple.

This individual is a very rare type of butterfly.