hot through-air nonwoven machine热风式非织布机
hot-air balloon热气球;热气球飞行器图片
hot-air drying热风干燥;热风烘燥
hot-air kiln热风干燥室
hot-air dryer热风烘房
hot-air generator热风机
hot-air ageing热空气老化
hot-air soldering[机] 热空气钎焊
hot-air dry热空气干燥
N-UNCOUNT（不可数名词） If you say that someone's claims or promises are just hot air, you are criticizing them because they are made mainly to impress people and have no real value or meaning. 空话; 夸夸其谈 [非正式]
His justification for the merger was just hot air.
他提出的合并理由只是连篇空话。