alert /əˈlɝt/
 警惕,警戒,警報(a.)警惕的,警覺的(v.)警惕


 alert
 警示


 alert
 報警信號


 alert
 警示 警報信號


 A·lert a.
 1. Watchful; vigilant; active in vigilance.
 2. Brisk; nimble; moving with celerity.
    An alert young fellow.   --Addison.
 Syn: -- Active; agile; lively; quick; prompt.


 A·lert, n. Mil. An alarm from a real or threatened attack; a sudden attack; also, a bugle sound to give warning. “We have had an alert.”
 On the alert, on the lookout or watch against attack or danger; ready to act.

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 alert
      adj 1: very attentive or observant; "an alert and responsive baby
             is a joy"; "caught by a couple of alert cops"; "alert
             enough to spot the opportunity when it came";
             "constantly alert and vigilant, like a sentinel on
             duty" [ant: unalert]
      2: mentally responsive; "an alert mind"
      3: not unconscious; especially having become conscious; "the
         patient is now awake and alert" [syn: awake(p)]
      4: (usually followed by `to') showing acute awareness; mentally
         perceptive; "alert to the problems"; "alive to what is
         going on"; "awake to the dangers of her situation"; "was
         now awake to the reality of his predicament" [syn: alive(p),
          awake(p)]
      n 1: condition of heightened watchfulness or preparation for
           action; "bombers were put on alert during the crisis"
           [syn: qui vive]
      2: a warning serves to make you more alert to danger [syn: alerting]
      3: an automatic signal (usually a sound) warning of danger
         [syn: alarm, warning signal, alarum]
      v : warn or arouse to a sense of danger or call to a state of
          preparedness; "The empty house alarmed him"; "We alerted
          the new neighbors to the high rate of burglaries" [syn: alarm]