I have to take a semen test.

Esperanto is one of the most famous international auxiliary languages.

Red dwarfs are the most common type of star in the universe.

He is troubled by chronic headaches.

She was wearing a very sexy dress.

In math class, I learned about the concept of intersection.

The opinion of society can sometimes be harsh.

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

His grandfather fought in the Second World War.

We dream of a day when all people can enjoy world peace.