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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。
A usually audible discharge of intestinal gas. 屁从肠内排出的(通常有声音的)气体
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。
audible alert 音响报警
An alert listener will have noticed the error. 耳朵尖的人能听出这个错。
Communication of audible signals encoded in electromagnetic waves. 无线通讯以电磁波密码进行的可听信号的联络
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。
Her voice was scarcely audible above the noise of the wind. 在风中她的声音几乎听不见。
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。
As the procession filed in, comments were audible. 当人们鱼贯而入时就议论开了。
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。
Their voices were audible to the neighbors. 他们的声音邻居都听得到。
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。
To move with quick, light, softly audible steps. 嗒嗒地跑用轻快微微听得见的步伐行走
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。