alert

[ə'lə:t]

adj.警觉的, 灵敏的
vt.使意识到, 警惕
n.警戒, 警报

a.

1. 警觉的; 警惕的; 留神的[(+to)]

She is alert to every sound and movement.

她对每一个声音和动作都很警觉。

2. 机敏的, 灵活的[(+in)]

The boy was alert in answering the stranger's questions.

男孩很机敏地回答了陌生人的问题。

n.[C]

1. 警戒, 警报

2. 警戒状态; 警戒期间

She was always on the alert for some new calamities.

她总是保持警觉以防某种新的灾难。

vt.

1. 向……报警; 使警觉; 使注意[(+to)]

The doctor alerted me to the danger of a heart attack.

医生提醒我注意心脏病发作的危险。

2. 通知(军队, 船只等)待命; 通知[(+for/about)][O2]

She's alerted me for weekend duty.

她已通知我周末值班。

词形变化

动词过去式: alerted | 动词过去分词: alerted | 动词现在分词: alerting | 动词第三人称单数: alerts |

词义辨析

同义:

a.警觉的; 机敏的

watchful  prompt  nimble  lively  ready  attentive  awake  vigilant  quick  clear-witted  wide awake  on the job  on one's toes  

同义参见:

cautious  smart  caution  warn  sharp  brilliant  signal  alive  bright  threaten  clever  fresh  agile  signal  circumspect  

反义:

a.警觉的; 机警的, 机敏的; 灵活的

heedless  asleep  sluggish  slow  dull  torpid  supine  languid  listless  lethargic  

反义参见:

drowsy  

英英释义

名词 alert:

condition of heightened watchfulness or preparation for action

同义词：qui vive

a warning serves to make you more alert to danger

同义词：alerting

an automatic signal (usually a sound) warning of danger

同义词：alarm, warning signal, alarum

动词 alert:

warn or arouse to a sense of danger or call to a state of preparedness

同义词：alarm

形容词 alert:

very attentive or observant

mentally responsive

not unconscious; especially having become conscious

同义词：awake

(usually followed by `to') showing acute awareness; mentally perceptive

同义词：alive, awake

短语词组

on the alert

1. 警戒着; 随时准备着

They have put the army on the alert.

他们已使军队进入戒备状态。

补充

alertalert英:[əˈlə:t] 美:[əˈlɚt]adj.1.警惕的, 警觉的, 注意的He is a man alert in problem.他是个留意问题的人。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。2.机灵的, 敏捷的He has an alert mind.他很机灵。A monkey is very alert in its movements.猴子的动作很敏捷。vt.1.使(某人)保持警觉The voice of the caller alerted her.呼唤者的声音使她警觉起来。2.提醒(某人)注意(某事)The boss alerted him that thief might come out at night.老板要他提防夜里可能有贼。n.1.警戒; 警报The whole navy was placed on full alert.整个海军都处于全面戒备状态。

例句

1. He had been spotted by an alert neighbour.他已经被一个警觉的邻居发现了。 2. We must stay alert.我们必须保持警惕。 3. They were both alert to the dangers.他们两个都注意到了危险情况。 4. He was arrested by a couple of alert cops.他被两个身手敏捷的警察逮捕了。 5. One of the security guards gave the alert.其中的一个保安发出了警报。 6. Officials raised the alert over a potential terrorist attack.官员们对潜在的恐怖袭击发出了警报。 7. Soldiers and police have been put on alert.士兵和警察已处于戒备状态。 8. Armed officers swarmed to the scene as paramedics waited on red alert.大批武装警察前往现场, 护理人员随时待命。 9. Prepare for action and be on the alert.准备行动, 保持警惕。 10. We are on the alert for new opportunities.我们留意着新的机会。 11. They want to be on the alert for similar buying opportunities.他们希望及时关注到类似的购买机会。 12. He pressed the horn to alert the guards.他按下喇叭, 向卫兵示意。 13. A passerby alerted the police.一个过路人报了警。 14. The fire brigade was alerted at 8.13pm.消防队于晚8点13分接到报警。 15. Greek officials admitted they were alerted before the attacks took place.希腊官员承认在袭击发生前他们接到了警报。 16. A detector was able to alert the family of the danger.探测器能够向家里人发出危险警报。 17. He wanted to alert people to the activities of the group.他想提醒人们小心这个团体的活动。 18. posters alerting people to the risks of smoking使人们意识到吸烟的危害的海报 19. The radio alerted coastal residents to prepare for the storm.无线电台向沿海居民发出警报，准备对付风暴。 20. to alert the government to the danger of inflation使政府警惕通货膨胀的危险 21. The troops were alerted.部队处于待命状态。 22. 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。 23. an alert police officer discovered a lorry full of explosive.一位警惕的警官发现了一辆满载炸药的卡车。 24. schools need to be constantly alert to this problem.各学校应该始终保持对此问题的警惕。 25. she remained active and alert until well into her eighties.她80多岁时仍然活跃机敏。 26. security forces were placed on alert.安全部队处于警戒状态。 27. a bomb alert.轰炸警报。 28. an alert sound-ed and all the fighters took off.警报响了，所有的战斗机随之起飞。 29. traffic was halted during the alert.警戒期间交通被中断。 30. a vibrating alert is a discreet alternative to ringtones.相对于铃声信号而言，振动提示信号是一种谨慎的替代手段。 31. he alerted people to the dangers of smoking.他提醒人们注意吸烟的种种危害。 32. police were alerted after three men drove away without paying.三个男人没付钱就开车走掉之后，警方开始警觉起来。 33. security forces are on the alert for an upsurge in violence.安全部队防备着冲突激化。 34. Security guards must be alert at all times.保安人员必须时刻保持警惕。 35. to be alert to possible changes留意可能出现的变化 36. a bomb alert炸弹警报 37. An alert guard stopped the robbers.机警的门卫拦住了劫匪。 38. The nurse kept/stayed alert for any change [=watched for any change] in the patient's condition.护士对病人病情的任何变化时刻保持警觉。 39. He was tired and had trouble staying alert while he was driving.他很疲倦，开车时无法保持警觉。 40. She wasn't mentally alert enough to answer the questions.她头脑不够机敏，回答不了这些问题。 41. an alert mind机敏的头脑 42. An alert watchdog guarded the door.一只警觉的看门狗看守着大门。 43. The nurse should be alert to any change in the patient's condition.护士应该对病人病情的任何变化都保持警觉。 44. He is alert to [=aware of] his duties as a father.他很清楚做父亲的责任。 45. A watchdog alertly guarded the door.一只看门狗警觉地看守着大门。 46. They sounded an alert when enemy planes were approaching the city.敌机接近城市时，他们发出了警报信号。 47. Medical officials have put out an alert to hospitals to look out for the virus.卫生官员已向各家医院发出警告，要小心这种病毒。 48. The government has issued a terrorism/security alert.政府已发出恐怖袭击/安全警告。 49. We need to be on alert for any sudden changes.我们需要密切注意任何突发情况。 50. "The attack could come at any time, so the soldiers need to be on full alert."进攻随时都有可能发生，因此士兵需要时刻保持高度警惕。 51. The recently flooded community is again on high alert as more rain is expected.预计更多的雨水将至，因此近期遭受洪涝灾害的地区再次处于高度戒备状态。 52. The soldiers need to be on the alert at all times.士兵们需要时刻保持警惕。 53. When you're driving in winter you should always be on the alert for icy conditions.冬天驾车时你应该时刻警惕出现路面结冰的情况。 54. I'm always on the alert for a good bargain.我一直留意着淘件便宜货。 55. Several neighbors alerted the authorities/police when they noticed strangers acting suspiciously.几个邻居注意到一些鬼鬼祟祟的陌生人，立即报告了当局/警方。 56. The governor alerted island residents that a hurricane was coming.州长警告岛上居民飓风即将来临。 57. The teacher alerted the students that tests would be given the next day.老师提醒学生第二天要进行测验。 58. A friend recently alerted me to the existence of a new museum in my city.一个朋友最近提醒我说在我居住的城市有一座新的博物馆。 59. We need to alert the public to the dangers of these chemicals. [=we need to tell the public about the dangers of these chemicals]我们需要提醒公众注意这些化学制品的危险性。