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1. Oxford Dictionary

   alert

   • IPA[əˈləːt]

   英式

   • adj.
     quick to notice any unusual and potentially dangerous or difficult circumstances; vigilant；able to think clearly; intellectually active
   • n.
     the state of being watchful for possible danger；an announcement or signal warning of danger
   • v.
     warn (someone) of a danger or problem

   • verb: alert, 3rd person present: alerts, gerund or present participle: alerting, past tense: alerted, past participle: alerted

   • noun: alert, plural noun: alerts

2. • 釋義
   • 相關詞

   adj.

   形容詞

   • 1. quick to notice any unusual and potentially dangerous or difficult circumstances; vigilant an alert police officer discovered a lorry full of explosive schools need to be constantly alert to this problem 同義詞 vigilant, hypervigilant, wide awake, aware, watchful, ... 更多attentive, observant, circumspect, wary, chary, heedful, canny, on the lookout, on one's guard, on one's toes, all ears, keeping one's eyes open/peeled, keeping a weather eye open, on the qui vive反義詞 inattentive
   • ▪ able to think clearly; intellectually active she remained active and alert until well into her eighties 同義詞 quick-witted, sharp, bright, quick, keen, ... 更多perceptive, wide awake, responsive, agile, acute, astute, informalon the ball, on one's toes, quick off the mark, quick on the uptake, all there, with it, bright-eyed and bushy-tailed反義詞 slow

   n.

   名詞

   • 1. the state of being watchful for possible danger security forces are on the alert for an upsurge in violence 同義詞 vigilance, watchfulness, carefulness, attentiveness, guardedness, ... 更多care, caution, cautiousness, wariness, chariness, alertness, hypervigilance, circumspection, prudence, heedfulness, heed, mindfulness反義詞 carelessness
   • ▪ an announcement or signal warning of danger a bomb alert 同義詞 warning, caution, notification, notice, exhortation, ... 更多injunction, siren, alarm, signal, danger signal, distress signal
   • ▪ a period of vigilance following a warning of danger traffic was halted during the alert
   • ▪ a signal on an electronic device that prompts the user to do something or attracts their attention a vibrating alert is a discreet alternative to ringtones

   v.

   動詞

   • 1. warn (someone) of a danger or problem he alerted people to the dangers of smoking police were alerted after three men drove away without paying

   spoiler alert

   • n.
     (in a discussion or review of a film, book, television drama, etc.) a warning that an important ... the third season ended (spoiler alert if you don't want to know) with the intervention of a ‘lady in red’

   Oxford American Dictionary

   AMBER Alert

   • n.
     an emergency response system that disseminates information about a missing person (usually a ... our state's AMBER Alert became operational last September

   Oxford American Dictionary

   spoiler alert

   • n.
     (in a discussion or review of a film, book, television drama, etc.) a warning that an important ... the third season ended (spoiler alert if you don't want to know) with the intervention of a ‘lady in red’

   Oxford Dictionary

   AMBER Alert

   • n.
     an emergency response system that disseminates information about a missing person (usually a ... our state's AMBER Alert became operational last September

   Oxford Dictionary

   on the alert

   • ph.
     vigilant and prepared

   Oxford American Dictionary

3. • 更多解釋

   alert

   • IPA[əˈlərt]

   美式

   • adj.
     quick to notice any unusual and potentially dangerous or difficult circumstances; vigilant: an alert police officer discovered a truck full of explosives schools need to be constantly alert to this problem
   • n.
     the state of being watchful for possible danger: security forces were placed on alert
   • v.
     warn (someone) of a danger, threat, or problem, typically with the intention of having it ... he alerted people to the dangers of smoking police were alerted after three men drove away without paying

   Oxford American Dictionary