sub·ser·vi·ent /-ənt/
  (a.)有幫助的,有用的,奉承的
  Sub·serv·i·ent a.  Fitted or disposed to subserve; useful in an inferior capacity; serving to promote some end; subordinate; hence, servile, truckling.
     Scarce ever reading anything which he did not make subservient in one kind or other.   --Bp. Fell.
     These ranks of creatures are subservient one to another.   --Ray.
     Their temporal ambition was wholly subservient to their proselytizing spirit.   --Burke.
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  subservient
       adj 1: compliant and obedient to authority; "editors and
              journalists who express opinions in print that are
              opposed to the interests of the rich are dismissed and
              replaced by subservient ones"-G. B. Shaw
       2: abjectly submissive; characteristic of a slave or servant;
          "slavish devotion to her job ruled her life"; "a slavish
          yes-man to the party bosses"- S.H.Adams; "she has become
          submissive and subservient" [syn: slavish, submissive]