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TOEFL BNC: 4966 COCA: 5318
alert
adjective /əˈlɜː(r)t/
  1. 1
    able to think in a clear and intelligent way 敏捷的;机警的

    She's remained physically fit and mentally alert. 她依然身体强壮,思维敏捷。

     Synonyms and related words
    Able to think clearly: alert, lucid, clear...
  2. 2
    paying attention to what is happening and ready to react quickly if necessary 警觉的;警惕的
    alert to :

    Parents must be alert to the symptoms of the disease. 家长必须对这种疾病的症状保持警觉。

     Synonyms and related words
    Attentiveness and paying attention: attention, regard, focused...

derived word

alertness

noun [U]
 Synonyms and related words
The ability to think clearly: clarity, objectivity, bandwidth...
alert
verb [T] /əˈlɜː(r)t/
present tense
I/you/we/theyalert
he/she/italerts
present participlealerting
past tensealerted
past participlealerted
  1. 1
    to tell someone in authority about a danger or problem so that they can take action to deal with it 向…报警;使警觉

    Neighbours heard the car being broken into and alerted the police. 邻居们听到汽车被砸的声音便报警了。

     Synonyms and related words
  2. 2
    formal to tell someone about something that may affect them 告诫
    alert someone to something :

    We will be assisting in alerting people to the dangers of cold weather. 我们将协助提醒人们对寒冷天气的危险保持警觉。

     Synonyms and related words
alert
noun [C] /əˈlɜː(r)t/
singularalert
pluralalerts
  1. a warning that something dangerous has happened or is going to happen 警报;警戒

    Flood alerts were issued for dozens of rivers. 数十条河流发出了洪水警报。

     Synonyms and related words
    Warning and warnings: warning, notice, caution...
    See also red alert

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