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单词 duality
释义 duality
 /dooh al"i tee, dyooh-/,  n.  
  1. a dual state or quality.
  2.  Math.   a symmetry within a mathematical system such that a theorem remains valid if certain objects, relations, or operations are interchanged, as the interchange of points and lines in a plane in projective geometry.
 [1350-1400; ME dualitie < LL dualitas. See DUAL, -ITY]
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