crit·i·cal /ˈkrɪtɪkəl/
 (a.)批評的,評論的;危急的,緊要的;臨界的


 crit·i·cal /ˈkrɪtɪkəl/ 形容詞
 危急的,極期的,臨界的,關鍵性的


 critical
 關鍵; 關鍵的


 critical
 臨界 緊要


 Crit·ic·al a.
 1. Qualified to criticise, or pass judgment upon, literary or artistic productions.
    It is submitted to the judgment of more critical ears to direct and determine what is graceful and what is not.   --Holder.
 2. Pertaining to criticism or the critic's art; of the nature of a criticism; accurate; as, critical knowledge; a critical dissertation.
 3. Inclined to make nice distinctions, or to exercise careful judgment and selection; exact; nicely judicious.
    Virgil was so critical in the rites of religion, that he would never have brought in such prayers as these, if they had not been agreeable to the Roman customs.   --Bp. Stillingfleet.
 4. Inclined to criticise or find fault; fastidious; captious; censorious; exacting.
 O gentle lady, do not put me to 't,
 For I am nothing, if not critical.   --Shak.
 5. Characterized by thoroughness and a reference to principles, as becomes a critic; as, a critical analysis of a subject.
 6.  Pertaining to, or indicating, a crisis, turning point, or specially important juncture; important as regards consequences; hence, of doubtful issue; attended with risk; dangerous; as, the critical stage of a fever; a critical situation.
    Our circumstances are indeed critical.   --Burke.
    The small moment, the exact point, the critical minute, on which every good work so much depends.   --South.
 Critical angle Optics, that angle of incidence of a luminous ray at which it is wholly reflected, and no portion of it transmitted. The sine of this angle is the reciprocal of the refractive index of the medium.
 Critical philosophy, the metaphysical system of Kant; -- so called from his most important work, the “Critique of Pure Reason.”

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 critical
      adj 1: marked by a tendency to find and call attention to errors
             and flaws; "a critical attitude" [ant: uncritical]
      2: at or of a point at which a property or phenomenon suffers
         an abrupt change especially having enough mass to sustain
         a chain reaction; "a critical temperature of water is 100
         degrees C--its boiling point at standard atmospheric
         pressure"; "critical mass"; "go critical" [ant: noncritical]
      3: characterized by careful evaluation and judgment; "a
         critical reading"; "a critical dissertation"; "a critical
         analysis of Melville's writings" [ant: uncritical]
      4: urgently needed; absolutely necessary; "a critical element
         of the plan"; "critical medical supplies"; "vital for a
         healthy society"; "of vital interest" [syn: vital]
      5: forming or having the nature of a turning point or crisis;
         "a critical point in the campaign"; "the critical test"
         [syn: decisive]
      6: being in or verging on a state of crisis or emergency; "a
         critical shortage of food"; "a critical illness"; "an
         illness at the critical stage" [ant: noncritical]
      7: of or involving or characteristic of critics or criticism;
         "critical acclaim"