a.  警觉的；警惕的；戒备的

a.  意识到；注意到

v.  向…报警；使警觉；使警惕；使戒备

v.  使意识到；使认识到

n.  警戒；戒备；警惕

n.  警报

• a bomb/fire alert  炸弹/火警警报

• be alert to  意识到

• been placed on (full) alert 

  处于（全面）戒备状态

• If they detect something wrong while the system is armed, they'll transmit a wireless alert signal to a base station that will then raise the alarm. 传输无线警报信号

• When the system thinks it's being jammed, it'll notify you via push alert (推送警报).

• It caught us in the act, sent an alert to my smartphone, and also listed our RF interference on the system's event log.

  发送警报

• She also knew from previous work conducted on birds and dolphins that these animals put half of their brains to sleep at a time so that they can rest while remaining alert enough to avoid predators (捕食者).

  休息的时候也能保持警惕

• She worked out that, if the left hemisphere was staying alert to keep guard in a strange environment, then it would react to the irregular beeps by stirring people from sleep and would ignore the regularly timed ones. 保持警惕

• Dutt aim to alert women researchers to all types of gender bias in the STEM disciplines. 旨在使这些女性研究人员意识到…

• 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。

• We must be alert to the possibility of danger. 我们必须认识到危险的可能性。

• Neighbours quickly alerted the emergency services.

  邻居很快向紧急情况服务部门报了警。

• 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。

• More than 5,000 troops have been placed on (full) alert.

  5000多名士兵已处于（全面）戒备状态。

BrE /əˈlɜːt/

NAmE /əˈlɜːrt/