quick to notice any unusual and potentially dangerous or difficult circumstances; vigilant
警惕的,警觉的,机警的
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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
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schools need to be constantly alert to this problem .各学校对此问题应该始终保持警惕。
able to think clearly; intellectually active
机灵的,机敏的
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she remained active and alert until well into her eighties .她80多岁时仍然活跃机敏。
the state of being watchful for possible danger
警惕,警戒
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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
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a bomb alert 轰炸警报
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an alert sounded 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
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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
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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。
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)
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he alerted people to the dangers of smoking 他提醒人们注意吸烟的种种危害
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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。
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on the alert vigilant and prepared 处于戒备状态security forces are on the alert for an upsurge in violence . 安全部队处于戒备状态,以防暴力升级
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stay alert 保持警惕
真题例句:
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alert eyes 警觉的眼睛
真题例句:
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be alert to/for ... 对...警觉;对...留意
真题例句:
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alert sb to sth 提醒某人注意某事
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on high/red alert 处于高度/红色戒备状态
真题例句:
"late 16th cent. (originally in military use): from French