The existence of dark matter has not yet been fully proven.

Antibiotics don't work for colds, so please don't take them unnecessarily.

It is said that antimatter has properties opposite to those of matter.

We exist as a part of the material world.

This food may contain carcinogens.

This painting is very valuable.

He is an infamous criminal in that area.

His calculating nature sometimes causes problems.

Looking at the bird flying high in the sky, I felt freedom.

He has a proud patriotism for his country.