adj.(形容词)

1. 警觉的，警惕的
2. 留神的
3. 机敏的，机灵的，灵活的，机警的，灵敏的
4. 精神抖擞的
5. 细心的
6. 活跃的

n.(名词)

1. 警戒期间，警戒期间，警报发出后，部队待机出动的时间
2. 警戒，警报，警惕，戒备
3. 警戒状态
4. 【军】紧急待命，战备，待命行动
5. 发警报
6. 报警信号
7. “警戒”（英国制造的巡逻艇）

v.(动词)

1. 使警觉， 使警戒，（使）警惕，使戒备，使（某人）保持警觉
2. 使注意，提醒，使...意识到， 使认识到，提醒（某人）注意
3. 通知待命，通知，通报
4. 向…报警，向…发出警报
5. 告诉
6. 发出警告，命令警戒
7. 清醒

adj.(形容词)

1. 警惕的,警觉的,注意的 watchful and ready to deal with danger
2. 机灵的,敏捷的 quick to see and act

v.(动词)

1. vt. 使处于戒备状态; 警告 make sb watchful and ready for possible danger

n.(名词)

1. [C][S]警戒；戒备；警惕 a situation in which people are watching for danger and ready to deal with it
2. [C]警报 a warning of danger or of a problem

Noun:

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

Adjective:

1. engaged in or accustomed to close observation;

   "caught by a couple of alert cops"
   "alert enough to spot the opportunity when it came"
   "constantly alert and vigilant, like a sentinel on duty"
   

2. quick and energetic;

   "a brisk walk in the park"
   "a lively gait"
   "a merry chase"
   "traveling at a rattling rate"
   "a snappy pace"
   "a spanking breeze"
   

3. mentally perceptive and responsive;

   "an alert mind"
   "alert to the problems"
   "alive to what is going on"
   "awake to the dangers of her situation"
   "was now awake to the reality of his predicament"
   

Verb:

1. warn or arouse to a sense of danger or call to a state of preparedness;

   "The empty house alarmed him"
   "We alerted the new neighbors to the high rate of burglaries"
   

1.警觉的；警惕的；留神的；机敏的
If you arealert, you are paying full attention to things around you and are able to deal with anything that might happen.

e.g. We all have to stayalert...
我们大家都必须保持警惕。
e.g. He had been spotted by analert neighbour.
一个警觉的邻居发现了他。

alertness
The drug improved mental alertness.
该药有助于提神。

2.充分意识到…的;完全感觉到…的
If you arealert to something, you are fully aware of it.

e.g. The bank isalert to the danger.
银行充分意识到了危险。

3.警戒（状态）；戒备（状态）
Analert is a situation in which people prepare themselves for something dangerous that might happen soon.

e.g. Due to a securityalert, 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。

4.向…报警；使警觉；使警惕；使注意
If youalert someoneto a situation, especially a dangerous or unpleasant situation, you tell them about it.

alert的意思

e.g. He wanted toalert people to the activities of the group...
他想提醒人们小心该团体的活动。
e.g. I was hoping he'dalert the police.
我当时希望他会报警。

5. see also: red alert

6.处于警戒状态;保持戒备
If soldiers or police areon alert, they are ready to deal with anything that may happen.

e.g. Soldiers and police have been put onalert.
士兵和警方都已进入警戒状态。

7.准备就绪；防备着
If you areon the alert for something, you are ready to deal with it if it happens.

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

1. alert的解释

1. 警告：以及Bently Nevada电涡流传感器),每个通道最多4个变量,具有独立积分和滤波控制,某些变量具有多达八极点的滤波,24位A/D转换器,25 kHz 带宽,4通道温度输入(E、J、K和 T 型热电偶),2级报警 - 警告(alert)和危险(DANGER),

2. 报警：选择的流程(Flow)(5),请注意鼠标指针的更改(6)(使用流程工具时,光标形状有所变化以表示当前位置是否可以作为流程定义的来源或目标). 12、 单击报 警(alert)模式 trigger (7),以指定目标,这样就出现一个箭头

3. 机警的：见过面对媒体英气逼人的晓明,再感受到晓明在明教中的那种放松,我能够很清楚的感受到晓明在工作中和生活中的两种不同状态. 工作时的他是机警的(alert),职业化的(professional)和专注的(dedicated),但是看起来很严肃,笑容仿佛穿上了无形的盔甲,时时防备着明枪暗箭.

4. 警报：过去他曾担任采访性杂志<>(alert)的主编,也出版过不少著作. 他的作品中包括朋克乐手尼克凯夫(Nick Cave)以及德国工业乐团(Einstürzende Neubauten)的自传. 沙弗瑞祖拉沃斯基毕业于波兰罗兹国际电影学校,

用作定语～+ n.

1. He has an alert mind.
   他很机灵。
2. The alert listener will have noticed the error.
   耳朵尖的人能听出这个错。

n. +～

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

用作表语S+be+～

1. Our guerrillas suddenly became alert as the dogs barked.
   狗叫了,我们的游击队员突然警觉起来。
2. The rabbit seems to be very alert all its life.
   兔子似乎一生都小心翼翼,十分警觉。

S+be+～+ prep. -phrase

1. Be alert for any sign of change in the patient.
   对这个病人的病情变化要密切注意。
2. The student is alert in answering the question.
   这个学生回答问题小心谨慎。
3. A monkey is very alert in its movements.
   猴子的动作很敏捷。
4. He is always alert to danger.
   他对危险时刻保持警惕。
5. She was alert to seizing an opportunity.
   她机敏地抓住一个机遇。

S+be+～+(that-)clause

1. So alert she was that not a single error in the report slipped her.
   她十分警觉,所以报告中没有一个错能逃过她的眼睛。

用作及物动词S+ ～+n./pron.

1. The voice of the caller alerted her.
   呼唤者的声音使她警觉起来。
2. Sirens alerted the cities long before the enemy bombers arrived.
   敌军轰炸机凌空以前,各城市早已鸣了警报。
3. They alert the public to the need for pollution control.
   他们提醒公众注意控制污染的必要性。
4. He had phoned the nearby villages, alerting them to the possibility of forest fires.
   他给附近几个村庄打了电话,叫人们注意森林可能起火。
1
5. The guard was alerted by a man climbing towards him.
   有一个人向卫兵爬过来,使卫兵警惕起来。

用作双宾动词S+～+ n./pron. +that-clause

1. The boss alerted the guard that thief might come out at night.
   老板要警卫提防夜里可能有贼。
2. The villagers alerted the traveller that wolves might come out in the night.
   村民们叫旅行者提防,夜晚有狼群出没。

用作宾补动词S+～+ n./pron. +to- v

1. The radio alerted coastal residents to prepare for the hurricane.
   电台警告沿海居民做好预防飓风的准备。
2. We will alert operating personnel to repair.
   我们将通知操作人员去维修。

其他

1. There are hurricane warning systems for alerting island residents.
   现在有了向岛上居民发出飓风警报的警报系统。

1. A national police alert was in effect.
   全国警察实行戒备。
2. The hurricane alert is over.
   飓风警报解除了。
3. The air-raid alert sounded at noon.
   正午时响起了空袭警报。
4. We'd just boarded the bus when the alert sounded.
   我们刚登上公共汽车，警报就响了。
5. If there is an alert, don't panic, just make your way to the exit.
   如果有警报，不要惊慌，只要走向太平门就行了。
6. The machine sounded the alert.
   机器发出了警报。
7. They received the alert at midnight.
   他们在午夜接到警报。
8. It's the alert signal.
   这是警报信号。
9. They were quiet during the alert.
   警戒期间他们很安静。
10. We should not run about aimlessly during an alert.
    警戒期间不可到处乱跑。
11. The whole country is in a state of alert.
    全国正处于戒备状态。
12. Security forces are on a high state of alert because of the President's visit.
    由于总统来访，保安部门处于高度警戒状态。
13. Sirens brought the whole street to the alert .
    警报声使整条街道进入戒备状态。

on alert

警戒着，防备着 ready to take action to deal with a dangerous situation

on the alert

密切注意着，随时准备着paying attention to what is happening and ready to react quickly if necessary

The alert leopard went up to a deer quietly.

警觉的豹子静悄悄地走近一只鹿。

Although he's over eighty his mind is still remarkably alert.

他虽已年过八十，但头脑仍然十分机敏。

I must alert him to the need to solve the problem.

我必须使他认识到解决这问题的必要性。

But we must remain on the alert.

但是我们现在仍然要保持警惕。

He decided he would stay more alert from now on.

他决定从现在起要更提高警惕了。

Troops are on the alert against any possible aggression.

军队戒备着可能的来犯。

One should not run about aimlessly during an alert.

空袭警报期间不可到处乱跑。

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.

n.(名词)

on alert,on the alert

这两个短语形似义近，其区别是：

on alert是针对危险情况的，意思是“防备着”；on the alert是针对事态发展的，意思是“随时准备着”。

• ☆ 17世纪进入英语，直接源自法语的alerte，意为vigilant；最初源自意大语的allerta，意为到高处。