音标：[əˈlə:ts] ；

n. 警戒( alert的名词复数 ); 警报期间; 警戒状态; 报警信号
v. 使（某人）保持警觉( alert的第三人称单数 ); 使意识到; 提醒（某人）注意（某事）; 使（部队）处于待命状态

n condition of heightened watchfulness or preparation for action
n a warning serves to make you more alert to danger
n an automatic signal (usually a sound) warning of danger
v warn or arouse to a sense of danger or call to a state of preparedness

alert的用法和样例：

例句

用作形容词(adj.)

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。

用作及物动词(vt.)

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。

用作名词(n.)

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。

常见句型

用作形容词(adj.)

用作定语～+ n.

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

n. +～

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

用作表语S+be+～

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。
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

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。
The student is alert in answering the question.这个学生回答问题小心谨慎。
A monkey is very alert in its movements.猴子的动作很敏捷。
He is always alert to danger.他对危险时刻保持警惕。
She was alert to seizing an opportunity.她机敏地抓住一个机遇。

S+be+～+(that-)clause

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。

用作动词(v.)

用作及物动词S+ ～+n./pron.

The voice of the caller alerted her.呼唤者的声音使她警觉起来。
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。
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。
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。

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

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。
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

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。
We will alert operating personnel to repair.我们将通知操作人员去维修。

其他

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。

用作名词(n.)

A national police alert was in effect.全国警察实行戒备。
The hurricane alert is over.飓风警报解除了。
The air-raid alert sounded at noon.正午时响起了空袭警报。
We'd just boarded the bus when the alert sounded.我们刚登上公共汽车，警报就响了。
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。
The machine sounded the alert.机器发出了警报。
They received the alert at midnight.他们在午夜接到警报。
It's the alert signal.这是警报信号。
They were quiet during the alert.警戒期间他们很安静。
We should not run about aimlessly during an alert.警戒期间不可到处乱跑。
The whole country is in a state of alert.全国正处于戒备状态。
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。
Sirens brought the whole street to the alert .警报声使整条街道进入戒备状态。

常用短语

用作名词(n.)

on alert

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

词汇搭配

用作形容词 (adj.)

～+名词

alert mind反应敏捷的头脑
alert movements敏捷的动作

～+副词

alert mentally思想上警惕

～+介词

alert in answering questions留心回答问题
alert to随时注意
alert to every sound and movement对任何响动都很警觉

用作动词 (v.)

～+名词

alert the public提醒公众

～+副词

alert amazingly吃惊地警告
alert cautiously小心地警告
alert extremely完全地警告
alert guardedly谨慎地警告
alert resolutely绝对地警告
alert sharply尖锐地警告
alert wisely聪明地警告

～+介词

alert to the danger提醒注意其危险性
alert to the need提醒注意其必要性

用作名词 (n.)

动词+～

call an alert发出警报
sound the alert拉响警报
call off an alert取消警戒状态
go on alert进入戒备

形容词+～

24-hour alert昼夜警戒
active alert战斗警报
blue alert空袭警报
false alert假警报
full alert全面戒备状态
general alert全面警戒
No 1 alert一级战备
preliminary alert预备警报
red alert紧急警报
white alert解除警报
yellow alert预备警报

名词+～

air alert空袭警报
ground alert地面待战
malfunction alert故障报警
nuclear alert核警报

介词+～

during an alert在警戒期间
in state of alert处于警戒状态

～+介词

the alert against any possible aggression警惕任何可能的侵略
the alert for any indications of battle注意任何战事的迹象

【近义词】

adj.

alarm
notify

warning
siren

【反义词】

adj.

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