alert

alert
adjective
  1. quick to notice any unusual and potentially dangerous or difficult circumstances; vigilant
    警惕的，警觉的，机警的
    an alert police officer discovered a lorry full of explosive.
    一位警惕的警官发现了一辆满载炸药的卡车。
    schools need to be constantly alert to this problem.
    各学校应该始终保持对此问题的警惕。
    ■able to think clearly; intellectually active
    机灵的，机敏的
    she remained active and alert until well into her eighties.
    她80多岁时仍然活跃机敏。
noun
  1. [mass noun]the state of being watchful for possible danger
    警惕，警戒
    security forces were placed on alert.
    安全部队处于警戒状态。
    ■[count noun]an announcement or signal warning of danger
    警报，警示
    a bomb alert.
    轰炸警报。
    an alert sound-ed and all the fighters took off.
    警报响了，所有的战斗机随之起飞。
    ■[count noun]a period of vigilance in response to such a warning
    警戒期
    traffic was halted during the alert.
    警戒期间交通被中断。
    ■[count noun]a signal on an electronic device that prompts the user to do something or attracts their attention
    （电子设备的）提示信号
    a vibrating alert is a discreet alternative to ringtones.
    相对于铃声信号而言，振动提示信号是一种谨慎的替代手段。
verb
  1. [with obj.]warn (someone) of a danger, threat, or problem, typically with the intention of having it avoided or dealt with
    （尤指为了避免或应付危险、威胁或问题而）提醒，警告（某人）
    he alerted people to the dangers of smoking.
    他提醒人们注意吸烟的种种危害。
    police were alerted after three men drove away without paying.
    三个男人没付钱就开车走掉之后，警方开始警觉起来。
常用词组
on the alert
  1. vigilant and prepared
    警惕着
    security forces are on the alert for an upsurge in violence.
    安全部队防备着冲突激化。
派生
alertly
adverb
alertness
noun
语源
  1. late 16th cent. (originally in military use): from French alerte, from Italian all' erta 'to the watchtower'
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