短语词组短语drying by circulating air 循环空气干燥by y air 乘飞机;通过航空途径By Cold Air 受冷空气影响by CNF Air Karachi 装运目的地by the air of 通过by pass air control 旁通空气控制pressurization by compressed air 空气定压by pass air duct 旁路空气导管 返回 by air