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TOEFL BNC: 4966 COCA: 5318
alert¹
/əˈlɜ:t ||; əˈlɝt/adj alert (to sth) watching, listening, etc for sth with all your attention 留心的;留神的;警觉的: Security guards must be alert at all times. 保安人员必须时刻保持警惕。 to be alert to possible changes 留意可能出现的变化
alert²
/əˈlɜ:t ||; əˈlɝt/noun [C] a warning of possible danger 警报: a bomb alert 炸弹警报 on the alert (for sth) ready or prepared for danger or an attack 警惕;戒备
alert³
/əˈlɜ:t ||; əˈlɝt/verb [T] alert sb (to sth) to warn sb of danger or a problem 警告;提醒
TOEFL BNC: 4966 COCA: 5318
alert1/əˋlɝt; əˈlɜːt/ adj always watching and ready to notice anything strange, unusual, or dangerous 警惕的﹐警觉的: I knew that I had to remain wide awake and alert. 我知道我必须保持十分清醒与警觉。+to Cyclists must always be alert to the dangers on a busy road. 骑自行车者必须时刻警惕拥挤道路上可能出现的危险。

alert2 v [T] to warn someone of a problem or of possible danger 向〔某人〕发出警告﹐使警觉: As soon as we suspected it was a bomb, we alerted the police. 我们一怀疑那是个炸弹﹐就报了警。

alert3 n 1 on the alert ready to notice and deal with a problem 防备着﹐保持警惕: +for Police are on the alert for trouble. 警方防备着会出现麻烦。All our troops are on full alert (=ready to deal with a serious problem). 我们所有的部队都处于全面戒备状态。 2 [C] a warning to be ready for possible danger 警报: a flood alert 洪水警报
TOEFL BNC: 4966 COCA: 5318
alert alertalertsalertedalerting1 adjectivewatching, listening, etc. for something with all your attention: A good driver is always alert.

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