Troops are on the alert against any possible aggression.
军队戒备着可能的来犯。
The enemy was on the alert.
敌人正在密切注意着。
on the alert (for something)
对某事警觉
to be careful or on the alert
戒备提防或戒备
The sentries were all on the alert.
哨兵们都警戒着。
The troops were kept constantly on the alert.
部队奉命常备不懈。
Old Jolyon was on the alert at once.
老乔里恩立刻警觉起来。
They must be constantly on the alert for the enemy.
他们必须随时注意敌人。
Strengthening training, always being on the alert.
加强训练，常备不懈。
They have put the army on the alert.
他们已使军队进入戒备状态。
Keep on the alert were due for an inspection.
提防着点, 轮到检查我们了。
They are always on the alert for traffic signals.
他们总是很留心交通信号。
Her fears had always been on the alert for an upheaval.
她日夜提心吊胆, 严防突变。
But we must remain on the alert.
但是我们现在仍然要保持警惕。
Hearing this, I was instantly on the alert.
我一听这话，当下就警惕起来。
Drivers must be on the alert for traffic signals.
驾驶员必须密切注意交通信号。
bird watchers on the alert for a rare species
密切注意稀有鸟类的鸟类观察家
We were constantly on the alert against any surprise attack.
我们时时刻刻都在提防突然袭击。
The policemen were on the alert for an excaped convict.
一名逃脱犯令警方全面警戒。
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。
An early warning system puts everyone on the alert.
预警系统让每个成员进入警戒状态。
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。
Dogs are always on the alert wherever they go.
无论在什么地方，狗总是处于警觉状态。
Her down on the alert and walked into a world of rivers.
她放下了戒备, 走进一个血流成河的世界。
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