agent
definitions
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noun
a person or thing that acts on behalf of another; a substance that causes a changeru: агент; вещество
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noun
a chemical or biological substance that produces a specific effectru: химическое вещество
examples
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The real estate agent showed the house.
Агент показал дом.
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The virus acts as an immune agent.
Вирус действует как иммунное вещество.