首页英语词典alertalert的意思

alert

英 [ə'lɜːt] 美[ə'lɝt]

英英释义词组搭配考试真题实用场景例句

近义词nimble ready quick vigilant awake job the lively on watchful prompt wide

反义词

vt. 警告；使警觉，使意识到
adj. 警惕的，警觉的；留心的
n. 警戒，警惕；警报
n. (Alert)人名；(西)阿莱尔特

CET4TEM4GRE考研TOEFLCET6中频词核心词汇

词态变化

复数: alerts;第三人称单数: alerts;过去式: alerted;过去分词: alerted;现在分词: alerting;名词: alertness;

中文词源

alert 警醒的

来自意大利语all’erta. -erta, 同 erect，竖直。即全部到城墙上守城。

英英释意

1. condition of heightened watchfulness or preparation for action;: "bombers were put on alert during the crisis"

2. a warning serves to make you more alert to danger

3. an automatic signal (usually a sound) warning of danger

英文词源

alert: alert: [17] Alert comes, via French, from an Italian phrase all’ erta ‘on the look-out’, or literally ‘at the (alla) watch-tower (erta)’. Erta was short for torre erta, literally ‘high tower’, in which the adjective erta ‘high’ came ultimately from Latin ērectus, the past participle of ērigere ‘raise’.
=> erect
alert (adv.): "on the watch," 1590s, from French alerte "vigilant" (17c.), from phrase à l'erte "on the watch," from Italian all'erta "to the height," from erta "lookout, high tower," noun use of fem. of erto, past participle of ergere "raise up," from Latin erigere "raise" (see erect). The adjective is attested from 1610s, the noun from 1803, and the verb from 1868. Related: Alerted; alerting.

考试真题

When the system thinks it's being jammed, it'll notify you via -94- push alert ( ' , 推送警报).

That approach will eliminate most cord-cutting concerns—but what about their wireless equivalent, jamming? With the right device tuned to the right frequency, what's to stop a thief from jamming your setup and blocking that alert signal from ever reaching the base station?Jamming concerns are nothing new, and they're not unique to security systems.

It caught us in the act, sent an alert to my smartphone, and also listed our RF interference on the system's event log.

If they detect something wrong while the system is armed, they'll transmit a wireless alert signal to a base station that will then raise the alarm.

More sleep in old age, however, is associated with better health, and most older people would feel better and more alert if they slept for longer periods, he said.

She also knew from previous work conducted on birds and dolphins that these animals put half of their brains to sleep at a time so that they can rest while remaining alert enough to avoid predators.

She worked out that, if the left hemisphere was staying alert to keep guard in a strange environment, then it would react to the irregular beeps by stirring people from sleep and would ignore the regularly timed ones.

When the system thinks it's being jammed, it'll notify you via push alert.

with the right device tuned to the right frequency, what's to stop a thief from jamming your setup and blocking that alert signal from ever reaching the base station?

To alert American workers to the urgency for adaptation.

Their risky behaviors—drinking too much alcohol, using illegal drugs, smoking cigarettes and skipping school—can alert parents and teachers that serious problems are brewing.

To be alert to fluctuations in foreign markets.

And when that is failed, they stop the hunters, banging on pots and pans to alert the deer.

Half of your brain stays alert and prepared for danger when you sleep in a new place, a study has revealed.

The researchers explained that the study demonstrated when we are in a novel environment the brain partly remains alert so that humans can defend themselves against any potential danger.

Consumers passionate about a product may create “owned” media by sending e-mail alerts about products and sales to customers registered with its Web site.

Jealousy and anger, for example, may have evolved to alert us to important inequalities.

The heightened alert followed an emergency meeting with flu experts in Geneva that assembled after a sharp rise in cases in Australia, and rising numbers in Britain, Japan, Chile and elsewhere.

词组搭配

on the alert

Watchful and prepared for danger, emergency, or opportunity

警戒着，防备着：注意着且防备着危险、意外或机会

bird watchers on the alert for a rare species.
看守者人密切注意稀有鸟类

实用场景例句

Police are warning the public to be on the alert for suspicious packages.: 警方警告公众要警惕可疑包裹。

More than 5 000 troops have been placed on (full) alert .: 5 000多名士兵已处于（全面）戒备状态。

a bomb/fire alert: 炸弹 / 火警警报

They had been alerted to the possibility of further price rises.: 他们已意识到价格可能继续上涨。

Neighbours quickly alerted the emergency services.: 邻居很快向紧急情况服务部门报了警。

Alerted by a noise downstairs, he sat up and turned on the light.: 楼下的响声使他警觉，他坐起来打开灯。

We must be alert to the possibility of danger.: 我们必须认识到危险的可能性。

Suddenly he found himself awake and fully alert.: 突然他发觉自己醒了过来，而且高度警觉。

Two alert scientists spotted the mistake.: 两个警觉的科学家发现了这个错误。

I was hoping he'd alert the police.: 我当时希望他会报警。

Soldiers and police have been put on alert.: 士兵和警方都已进入警戒状态。

They want to be on the alert for similar buying opportunities.: 他们希望随时掌握有关类似购买机会的信息。

He wanted to alert people to the activities of the group...: 他想提醒人们小心该团体的活动。

Due to a security alert, this train will not be stopping at Oxford Circus.: 由于安全戒备的原因，该次列车在“牛津街口广场”站将不停留。

The bank is alert to the danger.: 银行充分意识到了危险。

We all have to stay alert...: 我们大家都必须保持警惕。

He had been spotted by an alert neighbour.: 一个警觉的邻居发现了他。

What ever you choose to bring on your travels is of course an individual matter.: 选择在旅途中带上什么东西,当然是您的个人问题.

He is a man alert in problem.: 他是个留意问题的人.

Alert readers may have noticed the misprint in last week's column.: 细心的读者可能已经注意到上周专栏中的印刷错误了.

One should not run about aimlessly during an alert.: 空袭警报期间不可到处乱跑.

A monkey is very alert in its movements.: 猴子的动作很敏捷.

A sparrow is very alert in its movements.: 麻雀行动非常机灵.

They were constantly on the alert not to be taken by surprise.: 他们一直处于常备不懈状态以防突然袭击.

The district was put on red alert during a terrorist's bomb scare.: 这个地区在得到恐怖分子炸弹恐吓后作了应急准备.

The Armies were constantly on the alert not to be taken by surprise.: 部队一直处于警戒状态以防突然袭击.

In our reading we should always be alert for idiomatic expressions.: 我们在阅读过程中应经常注意惯用法.

Hearing this, I was instantly on the alert.: 我一听这话, 当下就警惕起来.

alert

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on the alert

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