ef·fec·tu·al /ɪˈfɛkʧə(wə)l, ˈfɛkʃwəl/
 (a.)有效果的,會應驗的,有效的
 Ef·fec·tu·al a.  Producing, or having adequate power or force to produce, an intended effect; adequate; efficient; operative; decisive.
    Effectual steps for the suppression of the rebellion.   --Macaulay.
 Effectual calling Theol., a doctrine concerning the work of the Holy Spirit in producing conviction of sin and acceptance of salvation by Christ, -- one of the five points of Calvinism. See Calvinism.
 Syn: -- Effectual, Efficacious, Effective.
 Usage: An efficacious remedy is had recourse to, and proves effective if it does decided good, effectual if it does all the good desired.
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 effectual
      adj 1: sufficient to produce a result; "a man to whom painting was
             but another and less effectual way of writing dramas
             or novels or history" [ant: ineffectual]
      2: producing or capable of producing an intended result or
         having a striking effect; "an air-cooled motor was more
         effective than a witch's broomstick for rapid
         long-distance transportation"-LewisMumford; "effective
         teaching methods"; "effective steps toward peace"; "made
         an effective entrance"; "his complaint proved to be
         effectual in bringing action"; "an efficacious law" [syn:
         effective, efficacious] [ant: ineffective]
      3: exerting or capable of exerting strong physiological or
         chemical effects; "an effectual vaccine"