We have a watchdog at our house, protecting our safety at night.

In Greek mythology, Cerberus, who appears, is said to be a three-headed dog guarding the gates of hell.

We decided to explore the unknown forest.

He exercised dominance at the meeting.

In Roman mythology, Ceres was the goddess of agriculture and grain.

This building was constructed centuries ago.

He is planning to build a new house.

This device can detect abnormalities at an early stage.

His computer detected a virus.

He is holding two posts at the same time as a professor and a researcher.