In his anger, he knocked down his opponent.

He likes to take a walk in the park at dusk.

In this chemical reaction, a specific isotope is produced.

She wrote her name in cursive script.

This sentence is written in bold typeface.

This pathogen is very dangerous to humans.

There is a possibility that unknown lifeforms exist on this planet.

He is deeply researching the theory of real number fields.

He saw the light through the transparent object.

This colony is forming a unique ecosystem.