He is learning how to use adjectives.

This octagonal table is very unique.

What kind of polygon is this?

This design is a quadrilateral.

The police dog helped to find the criminal.

When the earthquake alarm went off, we evacuated immediately.

The National Police Agency is the organization that oversees the police organizations in Japan.

He installed a sundial in the garden.

The atomic clock shows a very accurate time.

This antique clock is something I inherited from my grandfather.