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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.
chemical
This reaction occurs through a chemical process.
a chemist
He is an excellent chemist who made many discoveries.
petrochemistry
He is an expert in petrochemistry.
chemical equation
It's difficult to decipher this chemical equation.
Understanding chemical equations is difficult.
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