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]