red alert

red alert汉语翻译：
紧急警报英语解释：
名词 red alert:

the highest level of alert when an attack by the enemy seems immanent (or more generally a state of alert resulting from immanent danger)

The district was put on red alert during a terrorist bomb scare.这个地区在得到恐怖主义者轰炸后作了应急准备。