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  1. Oxford Dictionary

    facultative

    • IPA[ˈfakltətɪv]

    英式

    • adj.
      occurring optionally in response to circumstances rather than by nature；capable of but not restricted to a particular function or mode of life
    • 釋義

    形容詞

    • 1. occurring optionally in response to circumstances rather than by nature facultative adjustment in relation to competitive abilities
    • ▪ capable of but not restricted to a particular function or mode of life a facultative parasite
    • 更多解釋

    facultative

    • IPA[ˈfak(ə)lˌtādiv]

    美式

    • adj.
      occurring optionally in response to circumstances rather than by nature: the difference between facultative skin pigmentation and constitutive pigmentation is a function of overall sun exposure

    Oxford American Dictionary