The calyx is a part of the flower that plays a role in protecting the petals.

The wind blew, and the flower petals fluttered up.

Part of this movie is based on actual events.

He worked hard to accomplish his goals.

His role is the team leader.

She loves flowers.

This zoo is putting a lot of effort into the protection of endangered species.

He did his best to protect me from danger.

He told me the whole story of the incident.

He received the letter challenging him to a duel and began preparing for the duel.