alert level meaning in English

警戒级
警戒线
警示额度

Us raises terror alert level for all flights
美国提高所有航班恐怖威胁警戒级别
Okay , when we find the nerve gas and the alert level drops ,
好吧，我们查出神经毒气后安全警报水平降下来后
Alert level of preparedness plan for flu outbreak activated chinese version only
启动流感应变计划的戒备应变级别
Transcript of secretary for health , welfare and food on sars alert level
?生福利及食物局局长谈沙士应变计划戒备

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