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- Drivers must be on the alert for traffic signals. 司机必须注意交通信号。
- Troops are on the alert against any possible aggression. 军队戒备着可能的来犯。
- The city must be on the alert for being polluted. 城市要防止污染。
- You should be on the alert to any sudden change in the situation. 你们要对形势的突变有足够的准备。
- They did their best to keep on their guard (be on the alert). 他们尽量保持警惕。
- Every country that advocates peace must be on the alert. 每一个主张和平的国家都必须提高警惕。
- The public should be on the alert during thunderstorms. 市民对雷暴必须提高警觉。
- Passengers on buses should be on the alert against pick-pockets. 公共汽车上的乘客应提防扒手。
- Old Jolyon was on the alert at once. 老乔里恩立刻警觉起来。
- Large enemy forces were on the move; so we must be in the alert. 大批敌军在行动,因此我们必须提防着。
- Police warned the public to be on the alert for suspected terrorists. 警方警告群众警惕涉嫌的恐怖分子。
- 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。
- Knowing that danger threatened, they were on the alert. 因为知道可能会发生危险,他们处于戒备状态。
- Keep on the alert; we're due for an inspection. 提防着点,轮到检查我们了。
- The policemen were on the alert for an excaped convict. 一名逃脱犯令警方全面警戒。
- Knowing that danger threatened, the sentry was on the alert. 因为知道危险势将发生,这哨兵加意戒备。
- Her fears had always been on the alert for an upheaval. 她日夜提心吊胆,严防突变。
- Nuclear-armed bombers were on the alert during the crisis. 核武装轰炸机在危机期间处于警戒状态。
- They have put the army on the alert. 他们已使军队进入戒备状态。
- He and his wife seem to be on the outs these days. 他和他的妻子最近似乎感情很不好。