Please tell me the International Standard Book Number of this book.

The United Nations Security Council plays a crucial role in maintaining world peace and security.

The committee approved the new project.

Rui loves baseball.

The characters in this novel are complex and intriguing, like a stack.

Rui is accumulating study every day.

This room is six tatami mats in size.

He is an important character.

UNESCO is an international organization that promotes the development of education, science, and culture around the world.

This room is very warm.