vig·i·lant /-lənt/ 形容詞
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.
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,