This lemon is sour.

Please add a little vinegar to this salad.

The air in this area is greatly affected by pollutants emitted from factories.

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 reaction occurs through a chemical process.

He is an excellent chemist who made many discoveries.