com·ple·men·tar·i·ty /ˌkɑmplə(ˌ)mɛnˈtærəti, mən-/
  補充,補足
  com·ple·men·tar·i·ty /ˌkɑmplə(ˌ)mɛnˈtærətɪ, mən-/ 名詞
  互補性
  complementarity
       n 1: a relation between two opposite states or principles that
            together exhaust the possibilities
       2: the interrelation of reciprocity whereby one thing
          supplements or depends on the other; "the complementarity
          of the sexes"