音标：[ә'lә:t]
a. 警觉的, 灵敏的, 留心的
n. 警报
vt. 使警觉, 通知, 使意识到
【法】 警报, 警戒状态, 警戒期间
相关词组:
to alert sb to the danger of...
to alert sb to the fact that...
on the alert
英汉词典

alert的短语、例句：

alert adj ~ (to sth) attentive and quick to think or act 警惕的; 警觉的; 机警的
be alert to possible dangers 对可能发生的危险有警觉
The alert listener will have noticed the error. 耳朵尖的人能听出这个错.
Although he´s over eighty his mind is still remarkably alert. 他虽已年逾八十, 但头脑仍十分机敏. alert, n 1 (usu sing 通常作单数) (time of) special watchfulness before or during an attack 警戒（期间）
The troops were placed on full alert. 部队处於全面戒备状态. 2 warning given to prepare for danger or an attack 警报
give/receive the alert 发出[收到]警报. 3 (idm 习语) on the a`lert (against/for sth) watchful and prepared 警惕; 提防
Police warned the public to be on the alert for suspected terrorists. 警方警告群众警惕涉嫌的恐怖分子. alert, v 1 [Tn] warn (soldiers, etc) to watch for danger and be ready to act 使（士兵等）警戒, 戒备
Why weren´t the police alerted? 为什么警方没戒备起来? 2 [Tn.pr] ~ sb to sth make sb aware of sth 提醒某人注意某事
alert staff to the crisis facing the company 提醒职员注意公司面临的危局.