Proline is one of the components of proteins.

Protein is necessary for muscle growth.

The success of this project is a combination of many components.

He ate one apple.

Is it possible to change the configuration of this computer?

It took him a year to compose that song.

He is a real professional photographer.

His cooking skills are really professional.

He solves competitive programming problems every day.

The Bartholin's gland is a part of the female reproductive system and primarily secretes lubricating fluid.