alert

adj.

1. 警觉的；警惕的；戒备的
   able to think quickly; quick to notice things
   1. 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。
   2. Two alert scientists spotted the mistake.
      两个警觉的科学家发现了这个错误。
2. 意识到；注意到
   aware of sth, especially a problem or danger
   1. We must be alert to the possibility of danger.
      我们必须认识到危险的可能性。

verb

1. 向…报警；使警觉；使警惕；使戒备
   to warn sb about a dangerous or urgent situation
   1. Neighbours quickly alerted the emergency services.
      邻居很快向紧急情况服务部门报了警。
   2. 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。
2. 使意识到；使认识到
   to make sb aware of sth
   1. 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。

noun

1. 警戒；戒备；警惕
   a situation in which people are watching for danger and ready to deal with it
   1. 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。
   2. 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。
2. 警报
   a warning of danger or of a problem
   1. a bomb/fire alert
      炸弹 / 火警警报

1. ADJ-GRADED 警觉的；警惕的；留神的；机敏的
   If you are alert, you are paying full attention to things around you and are able to deal with anything that might happen.
   1. We all have to stay alert...
      我们大家都必须保持警惕。
   2. He had been spotted by an alert neighbour.
      一个警觉的邻居发现了他。
2. ADJ-GRADED 充分意识到…的;完全感觉到…的
   If you are alert to something, you are fully aware of it.
   1. The bank is alert to the danger.
      银行充分意识到了危险。
3. N-COUNT 警戒（状态）；戒备（状态）
   An alert is a situation in which people prepare themselves for something dangerous that might happen soon.
   1. 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。
4. VERB 向…报警；使警觉；使警惕；使注意
   If you alert someone to a situation, especially a dangerous or unpleasant situation, you tell them about it.
   1. 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。
   2. I was hoping he'd alert the police.
      我当时希望他会报警。
5. See also: red alert
6. PHRASE 处于警戒状态;保持戒备
   If soldiers or police are on alert, they are ready to deal with anything that may happen.
   1. Soldiers and police have been put on alert.
      士兵和警方都已进入警戒状态。
7. PHRASE 准备就绪；防备着
   If you are on the alert for something, you are ready to deal with it if it happens.
   1. 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。

1. We all have to stay alert
   我们大家都必须保持警惕。
2. He had been spotted by an alert neighbour.
   一个警觉的邻居发现了他。
3. The bank is alert to the danger.
   银行充分意识到了危险。
4. 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。
5. 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。
6. I was hoping he'd alert the police.
   我当时希望他会报警。
7. Soldiers and police have been put on alert.
   士兵和警方都已进入警戒状态。
8. 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。
9. The all clear was sounded about 10 minutes after the alert was given.
   警报发出10分钟后又响起解除的信号。
10. Troops in the Philippines have been put on full alert in anticipation of trouble during a planned general strike.
    因料到在有组织的大罢工期间可能会出现骚乱，菲律宾的军队已进入全面戒备状态。
11. 'Will you call the board to alert them that I feel I should resign?' — 'I'll do it. But I think you're copping out.'
    “你能不能给董事会打电话，提醒他们我觉得自己应该辞职？”——“我会的，但我认为你这是在逃避责任。”
12. If our environment cools, then messages from the skin alert the body's thermostat.
    如果外在环境变冷，体表会将这一信息传递给身体的体温调节中枢。
13. Bedrooms are fitted with alarm pull cords to alert the manager in an emergency.
    卧室中装有警报器拉绳，遇到紧急情况时可向经理报警。
14. The armed forces were on high alert to guard against any retaliation.
    武装部队保持高度戒备，以防发生任何报复行动。
15. All the Plymouth hospitals are on red alert
    普利茅斯所有的医院都处于紧急状态之中。
16. Sirens sounded an end to the red alert.
    警报声宣告了红色预警的结束。
17. I managed to walk around unchallenged for 10 minutes before an alert nurse spotted me.
    我四处走动了10分钟，没有受到查问，之后一位警觉的护士发现了我。
18. 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。
19. Hearing this, I was instantly on the alert.
    我一听这话，当下就警惕起来。
20. Don't alert the enemy.
    不要惊动敌人。
21. They were quiet during the alert.
    警戒期间他们保持安静。
22. 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。
23. The cat is alert to every sound and movement.
    那只猫对任何响动都很警觉。
24. The hurricane alert is over.
    飓风警报解除了。
25. He is always alert to danger.
    他对危险时刻保持警惕。
26. 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。
27. 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。
28. This is a very alert child.
    这个孩子灵极了。
29. We were constantly on the alert against any surprise attack.
    我们时时刻刻都在提防突然袭击。

  beware alert【导航词义：小心，使警觉】

  beware v. 谨防，当心

〔辨析〕主要用于祈使句，通常后接介词 of。

  alert v. 提醒，使警觉

〔辨析〕指提醒某人对某事物引起重视，常用于 alert sb to sth 结构。

noun

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

   Synonym:    alarmwarning signalalarum

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

   Synonym:    alerting

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

   Synonym:    qui vive

verb

1. warn or arouse to a sense of danger or call to a state of preparedness
   1. The empty house alarmed him
   2. We alerted the new neighbors to the high rate of burglaries

   Synonym:    alarm

adj

1. engaged in or accustomed to close observation
   1. caught by a couple of alert cops
   2. alert enough to spot the opportunity when it came
   3. constantly alert and vigilant, like a sentinel on duty

   Synonym:    watchful

2. mentally perceptive and responsive
   1. alert to the problems
   2. alive to what is going on
   3. awake to the dangers of her situation
   4. was now awake to the reality of his predicament

   Synonym:    alive(p)awake(p)

3. quick and energetic
   1. a brisk walk in the park
   2. a lively gait
   3. a merry chase
   4. traveling at a rattling rate
   5. a snappy pace
   6. a spanking breeze

   Synonym:    brisklivelymerryrattlingsnappyspankingzippy