airspace
特殊用法accessory airspace1.■副气室holding pattern airspace1.■(着陆)等待空域horizontal airspace1.■水平空域(空域水平宽度)lower airspace1.■下层空域navigable airspace1.■通航[领航]空域national airspace1.■领空restricted airspace1.■空中禁区terminal airspace1.■机场[航空站]空域upper airspace1.■上层空域vertical airspace1.■垂直空域(空域垂直距离)