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chemistry (branch of natural science)
He is an expert in chemistry.
toxicology
He is an expert in toxicology.
stairs used in emergencies
Please use the emergency stairs in case of a fire.
state of emergency (unusually difficult or dangerous situation)
Due to the earthquake, the city declared a state of emergency.
pollutant
The air in this area is greatly affected by pollutants emitted from factories.
dark matter
The existence of dark matter has not yet been fully proven.
antibiotics
Antibiotics don't work for colds, so please don't take them unnecessarily.
(physics) antimatter
It is said that antimatter has properties opposite to those of matter.
The material world.
We exist as a part of the material world.
carcinogen
This food may contain carcinogens.
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