alert adj. 1.警惕的,警觉的。 2.机警的,机灵的。 n. 1.警戒;警报。 2. 警戒期间。 3.【军事】紧急待命。 No. one alert 一级战备。 On the alert 警惕,提防。 vt. 使警戒。 The troops were alerted. 部队在待命中。 adv. -ly ,-ness n.
Assign supervisor and enclose alert area 设立监护人和警戒区域。
百科解释
An Alert Area is a place of alert for military aircraft at United States Air Force bases. During the Cold War, bomber aircraft would be stationed on the Christmas trees within the area, ready to take off at a moment's notice.