He is conducting research on historical kana usage.

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.

The Paleolithic is the first era of human history.

He said he couldn't agree with the views of the revisionists.

He is doing special exercises to strengthen his supraspinatus muscle.

By training the superior oblique muscle, there is a possibility that your eyesight can be improved.