red tag alert system红色标签警告系统
Red PR Alert红色口碑警报
red d alert紧急警报;红色预警;红色来袭
Red Bull Alert红牛闹钟
Red Shape Alert驱逐红色敌人选关版
Red-alert危机预警
Red Flag Alert最新危险警报
Red DP Alert红色动态定位警报
issue red alert发布红色警报
N-VAR（有变体名词） 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. 紧急警报
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。