on the alert

An early warning system puts everyone on the alert.

预警系统让每个成员进入警戒状态.

Following the bomb blast, local hospitals have been put on red alert .

炸弹爆炸之后，当地医院一直处于戒备状态。

Currently, first, the BRICs should be on the alert that hostile powers in developed countries may make mischief between them under the cover of ideology and history-made problems;

当前，它们一是要特别警惕发达国家中的敌对势力利用意识形态和历史遗留的问题挑拨离间；

When I first got to my university, I was on the alert for everything.

刚进大学时，我对一切都心存戒备。

They must be constantly on the alert for the enemy.

他们必须随时注意敌人.

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.

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.

All the Plymouth hospitals are on red alert.

普利茅斯所有的医院都处于紧急状态之中。

Bird watchers on the alert for a rare species; cops were on the job and caught them red-handed.

鸟类学家警惕地看的一个稀有品种；警察们很警惕并且当场抓获了他们。

The frontier guards, ever on the alert, stand watch over the borders of our country.

边防部队常备不懈地守卫着祖国边疆。

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.

These are the Chinese need to be on the alert.

这些都是需要中方警惕的.

Police are warning the public to be on the alert for suspicious packages.

警方警告公众要警惕可疑包裹。

Hearing this, I was instantly on the alert.

我一听这话, 当下就警惕起来.

But with the council back on the alert, it is not a good time for Stefan to fly off the handle.

但鉴于理事会再度警觉斯特凡此时无法自制实在不妙

The city must be on the alert for being polluted.

城市要防止污染.

They did their best to keep on their guard [ on the alert ] .

他们尽量保持 警惕.

The armed forces were on high alert to guard against any retaliation.

武装部队保持高度戒备，以防发生任何报复行动。

We were constantly on the alert against any surprise attack.

我们时时刻刻都在提防突然袭击。

Following the bomb blast, local hospitals have been put on red alert.

炸弹爆炸之后，当地医院一直处于戒备状态。

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.

Her fears had always been on the alert for an upheaval.

她日夜提心吊胆,严防突变.

When a desktop alert appears, click the down arrow on the alert.

出现“桌面通知”时，单击通知上的向下箭头。

The sentries were all on the alert.

哨兵们都警戒着.

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.

They should also be on the alert for the attack of typhoon.

此时,沿海居民应著手努力农耕和渔业,也应开始警觉台风来袭.

They want to be on the alert for similar buying opportunities.

他们希望随时掌握有关类似购买机会的信息。

Drivers must be on the alert for traffic signals.

驾驶员必须密切注意交通信号.

The policemen were on the alert for an excaped convict.

一名逃脱犯令警方全面警戒.

Troops are on the alert against any possible aggression.

军队戒备着可能的来犯.