He always teases me because he is mischievous.

Observing dark nebulae is difficult.

He decided to challenge the exploration of the Dark Continent.

Dark matter is covering this world.

He excels in every aspect of his job.

Looking at his various expressions, I felt that he was hiding something.

He was leaning against the parapet, looking at the distant scenery.

He was dismissed from the company.

This shirt is made of cotton.

This fine thread is very thin and feels good to the touch.