alert /əˈlɜːt/ star3 CET4 TEM4 (alerting,alerted,alerts)

• 1.  

  ADJ（形容词） 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

  例：

  We all have to stay alert.

  我们都必须保持警觉。

• 2.  

  N-UNCOUNT（不可数名词） alertness 警觉性

  例：

  The drug improved mental alertness.

  这种药物提高了大脑的灵敏度。

• 3.  

  ADJ（形容词） If you are alert to something, you are fully aware of it. 充分意识到的 [v-link ADJ 'to' n]

  例：

  The bank is alert to the danger.

  该银行对这种危险有警觉。

• 4.  

  N-COUNT（可数名词） An alert is a situation in which people prepare themselves for something dangerous that might happen soon. 戒备状态

  例：

  There has been criticism of how his administration handled last week's terrorism alert.

  对他的政府对待上周恐怖主义戒备状态的方式有批评之辞。

• 5.  

  V-T（及物动词） If you alert someone to a situation, especially a dangerous or unpleasant situation, you tell them about it. 向…发出警报

  例：

  He wanted to alert people to the activities of the group.

  他想警告人们注意这个组织的行动。

• 6.  

  PHRASE（习语） If you are on the alert for something, you are ready to deal with it if it happens. 准备应对

  例：

  They want to be on the alert for similar buying opportunities.

  他们要准备应对类似的购买机会。