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.

He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

Well then, I'm off.

The government issued a curfew to prevent the spread of the new coronavirus.

The system of provinces was a part of the ancient political system in Japan.

The Paleolithic is the first era of human history.