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]