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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。
It is dangerous to walk on thin ice in a lake. 在湖中薄冰上行走是很危险的。
The bird picked a hole in the ice with its beak. 那鸟在冰上啄出了一个洞。
The compacted snow on the pavement turned to ice. 人行道上被踩实的雪已变成了冰。
The host tell a joke to his guest to break the ice. 主人为了打破僵局，给客人讲了个笑话。
The lorry skidded on a stretch of black ice. 货车在薄冰路面上打滑。
The lorry went into a spin on a patch of ice. 卡车在一片冰地上打滑了。
They have put the army on the alert. 他们已使军队进入戒备状态。
The ship was nosing a way through the ice pack. 轮船小心地通过大块浮冰。
The alert leopard went up to a deer quietly. 警觉的豹子静悄悄地走近一只鹿。
The train was delayed because of ice on the line. 火车因铁轨结冰而误点。
An alert listener will have noticed the error. 耳朵尖的人能听出这个错。
I can move very fast across the ice on skates. 我穿着冰鞋在冰上滑得很快。
The ice cracked as I stepped onto it. 我一踩冰就裂了。
The lake was crusted over with ice. 河面上结了一层冰。
He put some food into the ice chest. 他把一些食物放进冰箱里。
She ordered a strawberry ice cream. 她要了一份草莓冰淇淋。