The government declared a state of emergency to prevent the spread of the new coronavirus.

He is conducting research on historical kana usage.

Revisionism aims to change our understanding of past events.

By regularly checking the key performance indicators, you can understand the performance of the company and devise improvement measures.

The Paleolithic is the first era of human history.

The Mesolithic is the era between the Paleolithic and the Neolithic.

The Bronze Age was an important period in human history.

The Azuchi-Momoyama period was a very important time in Japanese history.

The Azuchi-Momoyama period, also known as the Oda-Nobunaga period, was a very important time in Japanese history.

The Neolithic was an important period in human history.