警戒着, 随时准备着, 密切注意着;
She was always on the alert for some new calamities.
她总是保持警觉以防某种新的灾难.
The Armies were constantly on the alert not to be taken by surprise.
部队一直处于警戒状态以防突然袭击.
Her fears had always been on the alert for an upheaval.
她日夜提心吊胆,严防突变.
Troops are on the alert against any possible aggression.
军队戒备着可能的来犯.
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.
The policemen were on the alert for an excaped convict.
一名逃脱犯令警方全面警戒.
They were constantly on the alert not to be taken by surprise.
他们一直处于常备不懈状态以防突然袭击.
They must be constantly on the alert for the enemy.
他们必须随时注意敌人.
Drivers must be on the alert for traffic signals.
驾驶员必须密切注意交通信号.
Police are warning the public be on the alert for suspicious packages.
警方警告公众要警惕可疑包裹.
The sentries were all on the alert.
哨兵们都警戒着.
They did their best to keep on their guard [ on the alert ] .
他们尽量保持 警惕.
An early warning system puts everyone on the alert.
预警系统让每个成员进入警戒状态.
Hearing this, I was instantly on the alert.
我一听这话, 当下就警惕起来.
These are the Chinese need to be on the alert.
这些都是需要中方警惕的.
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