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TOEFL BNC: 4966 COCA: 5318

alert

Word family 
a·lert1 /əˈlɜːt $ -ɜːrt/ ●●○ adjectiveadj  
1  INTELLIGENTgiving all your attention to what is happening, being said etc 警惕的，警觉的
 The animal raised its head, suddenly alert.
那只动物突然警觉地抬起头来。
 Taking notes is one of the best ways to stay alert in lectures.
记笔记是听课时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 something CAREFULto 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.
当局早就应该对入侵的可能性有所警觉了。
Examples from the Corpus
alert to the possibility• The therapist should be alert to the possibilities of a patient losing all hope.• Third parties need to be alert to the possibility of change and to the actual practices of the body.• Be alert to the possibility of change to cross-talk between four people, which is much more difficult for the speechreader.• Music publishing companies are always alert to the possibility of signing new songwriting talent.• However, the teacher was still alert to the possibility that some children might use collaboration as a cover.
—alertness noun [uncountableU]
Examples from the Corpus
alert• The men sit up, alert.• The medicine can make it difficult to remain alert.• But working in this sort of hospital you are always aware of the potential and you have to be alert.• Even many of the civilians in Charleston, which lay three miles across the bay from Sumter, were alert and anxious.• Being aware of this, you will be alert and attentive to meaning.• Passengers should try to stay alert at all times, and report any suspicious packages to the police immediately.• For a compulsively pensive person, to be fully alert but free of thought is a form of ecstasy...• an alert driver• She owes her life to an alert farmer, who spotted her car in a ditch and called the emergency services.• He listens with an alert, humorless expression.• The second effort was another wonderfully alert piece of rugby.
stay alert• Blue gags on the image, tells himself to stay alert.• The men at the guns stayed alert.• They even set up a neat military system of two-man sentry duties, to make sure they stayed alert.• It was going to be another protracted day; he had to stay alert and miss nothing.• She sank deep down again, unable to stay alert, and saw without wanting to a giant Catherine-wheel in the sky.• You have to get it for yourself, by updating your skills constantly and staying alert to new opportunities.• As he retraced his steps of the past day avoiding streets and roads, he stayed alert to the sounds around him.
mentally alert• Bernhardt stated that she continued to sculpt into old age to remain mentally alert.• This applies both to the mentally alert and the mentally confused.• Jamie Shepherd was well over eighty, yet he was as mentally alert as a man half his age.• So the old man went for the rye and champagne, and I mentally alerted my whistle to coming attractions.• I felt stimulated - mentally alert, talkative and sociable.• When I come away from working with Slatkin I always feel more mentally alert than when I started.
alert2 ●●○ verb [transitiveT]  
1  WARNto 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。
► see thesaurus at warn
2  SHOW/LET somebody SEE somethingto make someone realize something important or dangerous 提醒，使〔某人〕意识到
alert somebody to something
 campaigns to alert the public to the dangers of HIV
让公众意识到艾滋病病毒危险的宣传活动
Examples from the Corpus
alert• When he realized that one engine was not working, the pilot alerted air traffic control.• The perimeter was alerted, and most were awake.• But it was really quite useful, since it alerted his audience to stand by for something unexpected.• Some authors have suggested that the clicks are made to alert other cats to the presence of the prey.• When we find kids circumventing them, we alert our members and try to get the information out as quickly as possible.• a poster campaign to alert people to the disease• The sensors alerted police within seconds and, in some instances, placed the gunshots within 20 feet of their origin.• Drivers are being alerted that an escaped prisoner has been seen hitch-hiking on the road to Frankfurt.• One fireman alerted the residents and helped them to safety.• Echoes of the signal alert them to possible prey, at ranges up to 80-90 metres in shallow waters.
alert somebody to something• A large sign alerts drivers to bad road conditions.
alert3 noun  
1  WARN[countableC] a 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 alert
2  on (the) alert (for something/somebody) READYready 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。
Examples from the Corpus
on high alert• Early in the war Soviet southern troops were put on high alert.
Examples from the Corpus
alert• If we bypass the decision we simply move into autopilot and the red alert comes into play.• Read in studio A city centre is still sealed off following a security alert earlier this afternoon.• Because of the potential seriousness of the incident, a site alert was announced.• a smog alert• But there is manipulation in these alerts.• He lists a handful of false virus alerts and urban myths.
a bomb/fire/terrorist etc alert• Several families were evacuated from their homes in Ulster last night after a bomb alert.• Then their wedding night in a luxury hotel was cut short at 6am - because of a fire alert.
Origin alert1
(1500-1600) French alerte, from Italian all' erta “on the watch”
a·lert1 adjectiveadjalert2 verbalert3 noun
Chinese
Syllable
Corpus
TOEFL BNC: 4966 COCA: 5318
alert

noun

ADJECTIVE | VERB + ALERT | ALERT + VERB | PREPOSITION | PHRASES ADJECTIVE➤heightened, high高度戒備狀態◇The country has put its troops on high alert.該國部隊處於高度戒備狀態。➤full全面戒備狀態➤amber, orange, red, yellow黃色戒備等級；橙色戒備等級；紅色戒備等級◇His sudden disappearance triggered a red alert among his friends.他的突然失踪讓朋友們都緊張起來。➤nationwide全國範圍的緊急戒備狀態▸➤bomb, fire, flood, pollution, security, terror轟炸／火災／洪水／污染／安全／恐怖警報◇A security alert was issued after four men escaped from the prison.4 名罪犯越獄後，當局發出安全警報。➤email電子郵件警報◇Receive regular email alerts about breaking news.定時接收有關爆炸式新聞的電子郵件提醒。VERB + ALERT➤issue, put out, raise, sound發出警報；拉響警報◇They rang the bells to sound the alert.他們敲響了鐘，發出警報。➤spark, trigger觸發／引發警報▸➤call off解除警報◇The alert was called off when it was found that the bomb was not live.發現炸彈未裝炸藥時，警報就解除了。ALERT + VERB➤go out警報發佈◇A nationwide alert went out for three escaped prisoners.全國範圍內發佈了警報，搜捕 3 名越獄逃犯。PREPOSITION➤on the alert戒備着；防備着▸➤alert for密切注意⋯◇You should always be on the alert for anyone who looks suspicious.你們應該時刻密切注意形跡可疑的人。PHRASES➤be on full alert處於全面警戒狀態◇The security forces are now on full alert.安全部隊現在處於全面警戒狀態。➤place sb on alert, put sb on alert使某人處於戒備狀態◇Thousands of police were put on full alert at all main roads leading to the city.在通向該城市的所有主要道路上有特派的數千警察全面戒備。➤keep sb on alert使某人保持戒備狀態➤a state of alert戒備狀態◇The army was yesterday placed on a state of alert in case of more riots.軍隊昨天處於戒備狀態以防出現更多的暴亂。
alert

adjective

VERBS | ADVERB | PREPOSITION VERBS➤be, look, seem警覺；看上去很警覺；好像很警惕▸➤become變得警覺▸➤remain, stay保持警覺▸➤keep sb使某人保持警覺◇The machine should help to keep the pilot alert.機器會幫助飛行員保持警覺。ADVERB➤extremely, fairly, very, etc.極其／相當／非常警惕▸➤fully完全警覺▸➤immediately, instantly, suddenly立刻／立即／突然警覺起來◇There was a noise outside and he was suddenly alert.外面有聲響，他突然警覺起來。➤always, constantly總是很警覺；始終保持警惕▸➤mentally機警◇He was as mentally alert as a man half his age.他像年齡小他一半的人一樣機警。PREPOSITION➤to對⋯保持警惕◇Climbers need to be alert to possible dangers.登山者需要對可能存在的危險保持警惕。
TOEFL BNC: 4966 COCA: 5318
alert verb
⇨ warnalert noun
⇨ warning (a bomb/fire alert) ⇨ on the alert ⇨ watch noun
TOEFL BNC: 4966 COCA: 5318
alert
Able to think clearly: alert, lucid, clear...
Attentiveness and paying attention: attention, regard, focused...
The ability to think clearly: clarity, objectivity, bandwidth...
To warn someone about or against something: warn, alert, tip off...
To tell someone something, or to give information: tell, deliver, report...
Warning and warnings: warning, notice, caution...

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