Troops in the Philippines have been put on full alert in anticipation of trouble during a planned general strike.

预期在计划的总罢工期间会有麻烦，在菲律宾的军队已处于完全戒备状态。

《柯林斯英汉双解大词典》

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。

《牛津词典》

Your epidemiologists are on the spot to investigate rumours or facts and put the regional and head office on alert, or in a position to reassure the rest of the world.

国家办事处的流行病学家可以立即针对谣言或事实进行调查，警示区域办事处和总部，或消除世界其它地区的忧虑。

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"When Blair put the troops on alert earlier this month the situation in Afghanistan was much less stable, " he said.

CNN: UK troops set to be stood down

Mumbai and the rest of Maharashtra state have been put on high alert following the blasts, with measures such as increased police presence on the streets and random vehicle searches.

BBC: India Home Minister Shinde visits Hyderabad blast site

On Thursday, police say he ambushed two officers, killing one, and then vanished, setting off a manhunt that put police on alert across the Southwest.

NPR: Court File: LA Ex-Cop Was Disturbed, Self-Obsessed