nec·es·sar·i·ly /ˌnɛsəˈsɛrəli/
  (ad.)必然地,必須地,必要地
  Nec·es·sa·ri·ly adv. In a necessary manner; by necessity; unavoidably; indispensably.
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  necessarily
       adv 1: in an essential manner; "such expenses are necessarily
              incurred" [syn: needfully] [ant: unnecessarily]
       2: in such a manner as could not be otherwise; "it is
          necessarily so"; "we must needs by objective" [syn: inevitably,
           of necessity, needs]
       3: as a highly likely consequence; "we are necessarily bound
          for federalism in Europe"