Mr. Takeshige is my best friend.

I will start working as a regular employee from next month.

A positive number is a number greater than zero.

This problem requires the calculation of the tangent.

Revisionism aims to change our understanding of past events.

He is conducting research on historical kana usage.

Today is China's National Day.

Keisaburo is my best friend.

He understands the meaning of the proverb 'Teaching is half learning', which means that teaching leads to one's own learning.

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