An imaginary unit is an important concept in mathematics.

An astronomical unit represents the average distance from the Earth to the Sun.

This product has a very small assembly unit.

How did the ancients live?

The creatures of the ancient times were significantly different from the creatures of today.

The culture of classical antiquity has a significant impact on the modern world.

The philosophy of Ancient Greece has a significant influence on modern thinking.

The buildings of Ancient Rome still inspire many people today.

He can speak Chinese fluently.

I am planning to travel to the Chugoku region next week.