Question

alert 【ALERT】A good hunting dog is alert to every sound and movement in the field. 好的猎犬对田野里的每一个动静都留心。【重点词汇】alert adj. 留心的 反: heedless

Accepted Answer

[ə'lɜːrt] 
alertwarn or arouse to a sense of danger or call to a state of preparedness
Alert! Alert! Alert! Did I get your attention? When you are alert, you are awake and ready. When you issue an alert you give warning, alerting people to, or notifying them of, a concern.
Alert is one of the rare words that can be used in the same form as a noun, verb, and adjective. In all parts of speech, alert implies preparedness. The word is derived from the French a l'erte which translates to "on the watch." When you hear the word, imagine an alarm going off. The alarm is the alert. When you hear it, you have been alerted and you are now alert.
All forms of 'alert' will appear on average once every 290 pages.alertalertingalertlyalertnessunalert

Front	alert
Pron	[ə'lɜːrt]
Back	【ALERT】 A good hunting dog is alert to every sound and movement in the field. 好的猎犬对田野里的每一个动静都留心。【重点词汇】 alert adj. 留心的反: heedless
Vocab	alertwarn or arouse to a sense of danger or call to a state of preparedness Alert! Alert! Alert! Did I get your attention? When you are alert, you are awake and ready. When you issue an alert you give warning, alerting people to, or notifying them of, a concern. Alert is one of the rare words that can be used in the same form as a noun, verb, and adjective. In all parts of speech, alert implies preparedness. The word is derived from the French a l'erte which translates to "on the watch." When you hear the word, imagine an alarm going off. The alarm is the alert. When you hear it, you have been alerted and you are now alert. All forms of 'alert' will appear on average once every 290 pages. alert alerting alertly alertness unalert

Alert Hear Alarm ə'Lɜːrt Good Hunting Dog Sound