alert

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【词性】：adj．

【释义】：

❶ 留心的，机警的〔an alert guard一位机警的哨兵〕
❷ 活跃的，机灵的〔Grandmother is very alert for a woman of eighty-five．作为一位85岁的妇女来说，祖母是很机灵了。〕‖ n．❶ 警戒，警报❷ 警戒期间‖ v．使警觉，使…处于待命状态〔The soldiers were alerted before the attack．在进攻之前，使士兵们都处于待命状态。〕／on the alert警惕，提防／alertly adv．／alertness n．