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  1. Oxford Dictionary

    reactant

    • IPA[rɪˈakt(ə)nt]

    英式

    • n.
      a substance that takes part in and undergoes change during a reaction.

    • noun: reactant, plural noun: reactants

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    reactant

    • IPA[rēˈaktnt]

    美式

    • n.
      a substance that takes part in and undergoes change during a reaction.

    Oxford American Dictionary