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

He is a perfectionist, so he is very strict about his work.

He played a perfect fifth scale on the piano.

The indefinite article is a basic part of English grammar.

Mr. Shinobu is my best friend.

This area is a no-entry area.

He was criticized for his unjust actions.

This chemical reaction is irreversible.

His unwavering determination became the power to overcome all difficulties.

Invisible light rays are not visible to the human eye.