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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。
My apron is so dirty that I have to wash it. 我的围裙太脏了，我不得不洗它。
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。
She tied an apron around her waist. 她将围裙系在腰间。
A maid in a white apron opened the door. 一个身著白围裙的女佣开了门。
A fighter plane is revving up on the hanger apron. 飞机库前面停机坪上，一架战斗机正在起动。
They have put the army on the alert. 他们已使军队进入戒备状态。
She wore a spotless white apron. 她围着一条洁白的围裙。
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。
Could you tie this apron round me? 你受累把围裙给我系上行吗?
apron alert 警戒坪
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。
She will never lave home; she is too tied to her mother's apron strings. 她永远也离不开家; 她太依赖她的母亲了。
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。
He's over twenty and lives at home, still tied to his mother's apron strings. 他20多岁了，还住在家里，仍然拴在母亲的围裙带上。