资料来源 : pyDict

沈著,镇定;聚精会神,专心志致;不乱方寸

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Presence \Pres"ence\, n. [F. pr['e]sence, L. praesentia. See
   {Present}.]
   1. The state of being present, or of being within sight or
      call, or at hand; -- opposed to absence.

   2. The place in which one is present; the part of space
      within one's ken, call, influence, etc.; neighborhood
      without the intervention of anything that forbids
      intercourse.

            Wrath shell be no more Thenceforth, but in thy
            presence joy entire.                  --Milton.

   3. Specifically, neighborhood to the person of one of
      superior of exalted rank; also, presence chamber.

            In such a presence here to plead my thoughts.
                                                  --Shak.

            An't please your grace, the two great cardinals.
            Wait in the presence.                 --Shak.

   4. The whole of the personal qualities of an individual;
      person; personality; especially, the person of a superior,
      as a sovereign.

            The Sovran Presence thus replied.     --Milton.

   5. An assembly, especially of person of rank or nobility;
      noble company.

            Odmar, of all this presence does contain, Give her
            your wreath whom you esteem most fair. --Dryden.

   6. Port, mien; air; personal appearence. ``Rather dignity of
      presence than beauty of aspect.'' --Bacon.

            A graceful presence bespeaks acceptance. -- Collier.

   {Presence chamber}, or {Presence room}, the room in which a
      great personage receives company. --Addison. `` Chambers
      of presence.'' --Bacon.

   {Presence of mind}, that state of the mind in which all its
      faculties are alert, prompt, and acting harmoniously in
      obedience to the will, enabling one to reach, as it were
      spontaneously or by intuition, just conclusions in sudden
      emergencies.

资料来源 : WordNet®

presence of mind
     n : self-control in a crisis; ability to say or do the right
         thing in an emergency