The Edo period in Japan was a time when culture and art greatly developed.

The ruins from the Kofun Period are important for a deep understanding of Japanese history.

The Ashikaga era is a part of Japanese history.

The Asuka Period is a part of Japanese history, a time when culture and arts greatly developed.

The Muromachi period is a part of Japanese history, a time when many cultural changes occurred.

The Kamakura period was a very important time in Japanese history.

Please remember this old proverb, 'A noble man compares and does not compete, a petty man competes and does not compare.'

A circumfix is a morpheme that creates a new meaning by attaching to the front and back of a word.

The circumpolar star is always visible in the north.

If you don't get regular dental check-ups, you may develop periodontitis.