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One should not run about aimlessly during an alert. 空袭警报期间不可到处乱跑。
She is always on the alert for some new calamity. 她总是保持警觉以防某种新的灾难。
Keep on the alert; we're due for an inspection. 提防着点，轮到检查我们了。
Be sure to be watchful or alert. 必须留神，千万要提防。
They have put the army on the alert. 他们已使军队进入戒备状态。
The alert leopard went up to a deer quietly. 警觉的豹子静悄悄地走近一只鹿。
An alert listener will have noticed the error. 耳朵尖的人能听出这个错。
A cluster of stars smaller than a constellation. 星群，星座比星座小的一簇星星
The district was put on red alert during a terrorist bomb scare. 这个地区在得到恐怖主义者轰炸后作了应急准备。
Crowded or massed into a dense cluster. 丛生的，聚生的聚集成密丛的
Alert to circumstances; attentive. 对周围环境敏感的; 留心的
Alert clustering 告警聚集
Troops are on the alert against any possible aggression. 军队戒备着可能的来犯。
A cluster of small iron balls formerly used as a cannon charge. 葡萄弹，霰弹以前用作火包装填物的一簇小铁丸
There was a little cluster of admirers around the actress. 女演员周围拥著一小群崇拜者。
The boy was alert in answering the stranger's questions. 男孩很机敏地回答了陌生人的问题。
Although he's over eighty his mind is still remarkably alert. 他虽已年过八十，但头脑仍然十分机敏。
Articles in Time's Medical Section often alert readers to unsuspected ailments. 《时代》周刊医药栏目里的文章常告诫读者对自己意想不到的疾病保持警惕。
The cat is alert to every sound and movement. 那只猫对任何响动都很警觉。
Clustering is a major method of data mining. 摘要聚类是数据挖掘中的主要方法。