red alert

1. N-VAR If a hospital, a police force, or a military force is on red alert, they have been warned that there may be an emergency, so they can be ready to deal with it. 緊急警報(bào)

All the St. Louis hospitals are on red alert. 所有的圣路易斯醫(yī)院都拉響了緊急警報(bào)。