His role is to fulfill his responsibilities as a leader.

Tokyo is the largest administrative region in Japan.

Japan's administrative divisions are divided into prefectures and municipalities.

It is important to understand the importance of health.

Feudalism characterized the social system of medieval Europe.

Changes in the social system inevitably occur with time.

Slavery is something that robs human dignity and is absolutely unacceptable.

His house is at the bottom of the mountain.

He put the book on the lower shelf.

He went down the stairs.