All the St. Louis hospitals are on red alert.

所有的圣路易斯医院都拉响了紧急警报。

《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》

During the air pollution red alert, the Beijing Commission of Education ordered all kindergartens, primary schools and middle schools to suspend classes.

在空气污染红色预警期间，北京市教委下令让所有幼儿园、小学和中学停课。

youdao

The NHS remains on red alert and normal services are not expected to resume until next week.

BBC: NHS will take days to recover

On Wednesday the hospital had stepped down to a 'red alert' after extra staff were called in.

BBC: Derriford Hospital

Red alert: it was the first time the indicator fell below the 1, 000 points mark in 12 months.

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