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TOEFL BNC: 4966 COCA: 5318
alert
əlɜːʳt əˈlɜrt
Word forms: plural , 3rd person singular present tense alerts, present participle alerting, past tense , past participle alerted
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. 警觉的;警惕的;留神的;机敏的
  • 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。

alertness
  • The drug improved mental alertness.

    该药有助于提神。

2 ADJ-GRADED 充分意识到;完全感觉到 If you are alert to something, you are fully aware of it. 充分意识到;完全感觉到
  • The bank is alert to the danger. [+ to]

    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. 警戒(状态);戒备(状态)
  • 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 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. 报警;使警觉;使警惕;使注意
  • He wanted to alert people to the activities of the group. [VERB noun + to]

    他想提醒人们小心该团体的活动。

  • I was hoping he'd alert the police. [VERB noun]

    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. 处于警戒状态;保持戒备
  • 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. 准备就绪;防备着
  • 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。

Trends of alert
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