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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。
Calculation methods about the effective scope of the anti-aerospace alert net 对空警戒网有效探测范围的计算方法
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're completely anti the new proposals. 他们完全反对新的提议。
He hit the tennis ball over the net. 他把网球打过了网。
They have put the army on the alert. 他们已使军队进入戒备状态。
The ball glanced off the goal post into the net. 球撞到球门柱上斜飞入网。
The alert leopard went up to a deer quietly. 警觉的豹子静悄悄地走近一只鹿。
The net weight of this jar of coffee is 180 grams. 这瓶咖啡净重180克。
An alert listener will have noticed the error. 耳朵尖的人能听出这个错。
If I lose my job, I've got no safety net. 我丢掉这份工作就无计可施了。
The fish tangled in the mesh of the net has died. 那条卡在网眼上的鱼已经死了。
The aerospace industry in our country has developed greatly after liberation. 解放后，我国的宇航事业取得了巨大的发展。
Practise throwing the ball into the net. 练习投篮。
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。
She just tipped the ball over the net. 她刚好把球击过网。
Alert to circumstances; attentive. 对周围环境敏感的; 留心的
My fishing-line got fouled (up) in an old net. 我的钓丝跟旧鱼网缠在一起了。