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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。
Amazingly, the job went to a rank outsider. 真怪，那工作竟然交给了一个万万想不到的人。
The girl was amazingly courageous. 那女孩惊人地勇敢。
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。
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。
Alert to circumstances; attentive. 对周围环境敏感的; 留心的
Troops are on the alert against any possible aggression. 军队戒备着可能的来犯。
He's amazingly cheerful considering all that he's been through. 鉴於他经历过的种种遭遇，他的乐天达观令人惊叹。
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。
She was amazingly well read in the newest books. 很令人惊讶她对最新书籍了解颇多。
Even those passengers who were most distrustful of themselves plucked up amazingly. 甚至那些对自己最缺乏信心的乘客也鼓起了勇气，真令人惊异。
Suddenly the combat alert sounded. 突然战斗警报响了。