He decided to abdicate the throne.

He left the soccer team last year.

He decided to leave the music group.

He played an active role as a captain in a historical war.

This building is made of fire-resistant materials.

Mr. Taira is my best friend.

He found out that there was a foreign object inside his body.

I had the opportunity to talk with a famous writer.

The degeneration of this species is due to environmental changes.

This species has degenerated over time.