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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

2. • 釋義

   n.

   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