help·ful /ˈhɛlpfəl; ||ˈhɛp ||ˈhɛəp-/
 (a.)有幫助的,有益的,有用的


 Help·ful a. Furnishing help; giving aid; assistant; useful; salutary.
 Heavens make our presence and our practices
 Pleasant and helpful to him!   --Shak.
 -- Help*ful*ly, adv. -- Help*ful*ness, n.

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 helpful
      adj 1: providing assistance or serving a useful function [ant: unhelpful]
      2: of service or assistance; "a child who is helpful around the
         house can save the mother many steps"
      3: showing a willingness to cooperate; "a helpful cooperative
         patient"; "parents hope to raise children who are
         considerate and helpful to others"