cen·tral·i·ty /sɛnˈtræləti/
  中心,中央,向心性
  Cen·tral·i·ty n.; pl. Centralities  The state of being central; tendency towards a center.
     Meantime there is a great centrality, a centripetence equal to the centrifugence.   --R. W. Emerson.
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  centrality
       n : the property of being central [ant: marginality]