vig·i·lant /ˈvɪʤələnt/
 (a.)警醒的,警戒著的,警惕的


 vig·i·lant /-lənt/ 形容詞
 不眠症


 Vig·i·lant a.  Attentive to discover and avoid danger, or to provide for safety; wakeful; watchful; circumspect; wary.  “Be sober, be vigilant.”
    Sirs, take your places, and be vigilant.   --Shak.

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 vigilant
      adj : carefully observant or attentive; on the lookout for
            possible danger; "a policy of open-eyed awareness";
            "the vigilant eye of the town watch"; "there was a
            watchful dignity in the room"; "a watchful parent with
            a toddler in tow" [syn: argus-eyed, open-eyed, wakeful,
             watchful]