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TOEFL BNC: 4966 COCA: 5318

C1 quick to see, understand, and act in a particular situation机警的,机敏的,敏捷的

I'm not feeling very alert today - not enough sleep last night!今天我感觉特迟钝——昨晚没睡好!
A couple of alert readers posted comments on the website pointing out the mistake.有几个眼尖的读者在网上发表评论,指出了这个错误。
Parents should be alert to sudden changes in children's behaviour.父母应该对孩子行为的突然变化有所警觉。

More examples

Doing puzzles and crosswords regularly keeps your mind alert and active.

Although Granny was frail in her old age, but was mentally very alert.

He was normally a bright, alert baby, so she felt sure there was something seriously wrong.

A small animal must always remain alert for predators.

There have been some thefts recently, so please stay alert and don't leave handbags and valuables around.

C1 a warning to people to be prepared to deal with something dangerous警报

a bomb alert炸弹警报
The army was put on (full) alert as the peace talks began to fail.当和谈开始破裂的时候,军队进入(全面)戒备状态。
The public were warned to be on the alert for (= watching carefully for) suspicious packages.有关部门提醒公众,要警惕可疑包裹。

C2 to warn someone of a possibly dangerous situation使警觉,使警惕;向…发出警报

An anonymous letter alerted police to the possibility of a terrorist attack at the airport.有人给警察写了一封匿名信,警告机场可能会受到恐怖袭击。

More examples

If you hear a flood warning, please alert your neighbours and make emergency preparations.

Until I saw my statement, there was nothing to alert me that someone else was using my credit card number.

We encourage parents to alert the school about any concerns or difficulties at home.

We don't want to alarm people unnecessarily, but they should be alerted to potential dangers.

A note of formality in his voice alerted her to the fact that others were listening.

TOEFL BNC: 4966 COCA: 5318
alert

noun

ADJECTIVE | VERB + ALERT | ALERT + VERB | PREPOSITION | PHRASES ADJECTIVEheightened, 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 + ALERTissue, 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 + VERBgo 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。PREPOSITIONon 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。PHRASESbe 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 VERBSbe, 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。ADVERBextremely, 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。PREPOSITIONto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
warn
alert 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...
Warning and warnings: warning, notice, caution...

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