This lake is known as a dangerous body of water.

Please use the emergency stairs in case of a fire.

Due to the earthquake, the city declared a state of emergency.

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.