The wheel of my bicycle has gone flat.

Lithium hydride plays an important role in chemical reactions.

Hydrogen peroxide is often used for disinfecting wounds.

He is a world-famous archaeologist.

He is traveling around the world as an ecologist.

He is a world-renowned bacteriologist.

He is a famous philosopher.

Aristotle was a famous philosopher in ancient Greece.

His hobby is underwater photography.

She has a beautiful figure from behind.