ben·e·fi·cial /ˌbɛnəˈfɪʃəl/
  (a.)有益的,有幫助的
  Ben·e·fi·cial a.
  1. Conferring benefits; useful; profitable; helpful; advantageous; serviceable; contributing to a valuable end; -- followed by to.
     The war which would have been most beneficial to us.   --Swift.
  2. Law Receiving, or entitled to have or receive, advantage, use, or benefit; as, the beneficial owner of an estate.
  3. King. [Obs.]  “A beneficial foe.”
  Syn: -- See Advantage.
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  beneficial
       adj 1: promoting or enhancing well-being; "an arms limitation
              agreement beneficial to all countries"; "the
              beneficial effects of a temperate climate"; "the
              experience was good for her" [syn: good]
       2: tending to promote physical well-being; beneficial to
          health; "beneficial effects of a balanced diet"; "a good
          night's sleep"; "the salutary influence of pure air" [syn:
           good, salutary]