Examlex
Radon is a radioactive gas found in certain soils,rocks,and natural building materials.
Fluctuation
An irregular rising and falling in number or amount; a variation.
Expectations
Beliefs or anticipations about the future, often based on experience, knowledge, or perceived trends.
Illicit Drug
A substance whose production, sale, or use is prohibited by law, often associated with addiction and illegal trade.
Endorphins
Natural chemicals in the body that fight pain and promote feelings of pleasure and well-being.
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