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  1. Oxford Dictionary

    unknown quantity

    • n.
      a person or thing whose nature, value, or significance cannot be determined or is not yet known

    • noun: unknown quantity, plural noun: unknown quantities

    • 釋義

    名詞

    • 1. a person or thing whose nature, value, or significance cannot be determined or is not yet known the producers replaced her with an unknown quantity a student ensemble is always something of an unknown quantity