op·er·a·tive /ˈɑp(ə)rətɪv, ˈɑpəˌre-/
  (a.)動作的,運轉的,生產有關的職員,刑警,偵探
  op·er·a·tive /ˈɑp(ə)rətɪv, ˈɑpəˌret-/ 形容詞
  操作的,工作的,有效的,手術的,有關手術的,活動的
  Op·er·a·tive a.
  1. Having the power of acting; hence, exerting force, physical or moral; active in the production of effects; as, an operative motive; operative laws.
     It holds in all operative principles.   --South.
  2. Producing the appropriate or designed effect; efficacious; effective; as, an operative dose, rule, or penalty.
  3. Surg. Based upon, or consisting of, an operation or operations; as, operative surgery.
  Op·er·a·tive, n.
  1. A skilled worker; an artisan; esp., one who operates a machine in a mill or manufactory.
  ◄ ►
  operative
       adj 1: being in force or having or exerting force; "operative
              regulations"; "the major tendencies operative in the
              American political system" [ant: inoperative]
       2: of or relating to a surgical operation; "operative surgery"
       3: relating to or requiring or amenable to treatment by surgery
          especially as opposed to medicine; "a surgical appendix";
          "a surgical procedure"; "operative dentistry" [syn: surgical]
          [ant: medical]
       4: effective; producing a desired effect; "the operative word"
          [syn: key]
       5: (of e.g. a machine) performing or capable of performing; "in
          running (or working) order"; "a functional set of brakes"
          [syn: running(a), functional, working(a)]
       n 1: a person secretly employed in espionage for a government
            [syn: secret agent, intelligence officer, intelligence
            agent]
       2: someone who can be employed as a detective to collect
          information [syn: private detective, PI, private eye,
           private investigator, shamus, sherlock]