The seed of his success lies in his effort.

He is an expert in chemistry.

A day has 24 hours.

He ate one apple.

It is important for each person to fulfill their role.

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.

This food may contain carcinogens.

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