In this chemical reaction, ammonium is produced.

Her name is Tei, and true to her name, she is a very noble person.

The Paleolithic is the first era of human history.

The Bronze Age was an important period in human history.

The Neolithic was an important period in human history.

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

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

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

He told me the whole story of the incident.

Kamakura Udaijin is the courtesy name of Minamoto no Sanetomo.