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.

A lower triangular matrix is a matrix where all the elements below the main diagonal are zero.

When learning Japanese grammar, it is important to understand verbs in the lower monograde conjugation.

I hurried down the lower two steps.

He is the unsung hero of the team.