| 单词 | alert |
| 例句 | alert adjective 1.•police have asked neighbors to stay alert:vigilant, watchful, attentive, observant, wide awake, circumspect | on the lookout, on one's guard, on one's toes, on the qui vive | informal heads-up, keeping one's eyes open/peeled, bright-eyed and bushy-tailed. ANT inattentive. 2.•mentally alert:quick-witted, sharp, bright, quick, keen, perceptive, wide awake, on one's toes | informal on the ball, quick on the uptake, all there, with it. ANT inattentive, slow-witted.▶noun 1.•a state of alert:vigilance, watchfulness, attentiveness, alertness, circumspection. 2.•a flood alert:warning, notification, notice | siren, alarm, signal, danger signal, distress signal.▶verb •police were alerted by a phone call:warn, notify, apprise, forewarn, put on one's guard, put on the qui vive | informal tip off, clue in. |
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