Mr. Matsumoto is my best friend.

This method is very effective.

His smile was ephemeral, disappearing in an instant.

He is leading a religious life.

He started cleaning voluntarily.

A new approach is needed to solve this perpetual problem.

His house has a very modern design.

His secondary role greatly contributed to the success of the team.

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

The Empire of Japan, written as 大日本帝國 in Kyūjitai, was a nation that existed from 1868 to 1945.