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。

《牛津词典》

As you look at your listeners, be alert for their reactions.

在看你的听众时，要注意他们的反应。

youdao

Now I want you to relax and, at the same time get a little bit alert for a change.

大家放松一下，不过同时，也要机灵点，变化来了。

youdao

The U.S.State Department has issued a fresh travel alert for India, saying the U.S.government continues to receive information that terrorist groups may be planning attacks here.

VOA: standard.2009.10.30

Dr.Chan said all countries should immediately activate their pandemic preparedness plans and countries should remain on high alert for unusual outbreaks of influenza-like illness and severe pneumonia.

VOA: standard.2009.04.29

For the first time the W.H.O.raised its alert level from phase four to phase five on April twenty-ninth.

VOA: special.2009.05.06

It was after lunch that teachers first got word to be on alert for severe weather.

CNN: SHARE THIS

Interpol issued a high alert for Assange on Wednesday at the request of Sweden.

CNN: The secret life of Julian Assange

When risk of new legislation increases, market participants are on heightened alert for redistribution.

FORBES: What a Hotly Contested Election Means for Markets