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》

The yellow and red line on the chart above represents the alert thresholds.

图中，黄色和红色的线条表示警戒阈值。

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

The south and centre have been placed on red alert because of the floods, which have claimed several lives.

BBC: Mozambique 'to evacuate thousands' because of flooding

Visiting the Royal Sussex County Hospital in Brighton on Thursday, Health Secretary Alan Milburn said the health service would continue to be on red alert.

BBC: NHS will take days to recover