alert
1
a·lert / əˈlɚt ; əˈlɜ:t /adjective
1. giving all your attention to what is happening, being said etc警惕的，警觉的:
•The animal raised its head, suddenly alert.那只动物抬起头，突然警觉起来。
•Taking notes is one of the best ways to stay alert in lectures.记笔记是听课集中注意力的最佳方法之一。
2. able to think quickly and clearly机警的，机敏的:•Jack was as mentally alert as a man half his age.杰克的头脑和年龄小他一半的人一样灵活。
3. be alert to sth to know about or understand something, especially a possible danger or problem警觉某事:•The authorities should have been alert to the possibility of invasion.当局早就应该认识到入侵的可能性了。
—alertness noun U2
alertverb T
1. to officially warn someone about a problem or danger so that they are ready to deal with it使警觉; 向…发出警报:
•The school immediately alerted the police .学校立即报了警。
2. to make someone realize something important or dangerous提醒，引起〔某人〕重视:alert sb to sth
•campaigns to alert the public to the dangers of HIV使公众认识到艾滋病病毒危险的宣传活动
3
alertnoun
1. Ca warning to be ready for possible danger警报:
a bomb / fire / terrorist etc alert
•a full-scale flood alert最高级别的防洪警报
•The bomb alert was raised soon after midnight.刚过子夜，防空警报就拉响了。
⇒RED ALERT2. on (the) alert (for sth / sb) ready to notice and deal with a situation or problem（对某事物/某人）保持警惕:
•Be on the alert for anyone acting suspiciously.警惕举止可疑的人。
•Troops in the vicinity were put on alert .附近地区的军队受命进入戒备状态。
on full alert also on high alert (=completely ready to deal with a dangerous situation) 全面戒备•All our border points are on full alert.我们所有的边防站都处于全面戒备状态。
