agent
definitions
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noun
a person or thing that acts on behalf of another; a substance that causes a changede: Vertreter; Wirkstoff
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noun
a chemical or biological substance that produces a specific effectde: chemische Substanz
examples
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The real estate agent showed the house.
Der Makler zeigte das Haus.
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The virus acts as an immune agent.
Das Virus wirkt als Immunstoff.