英语翻译两种原因,第一是你的手出汗,汗蒸发遇到冷的袋子以后液化成为小水珠.第二是你的手比袋内的空气热,使得袋内空气中本身

法语,哈哈,有点不好意思,我当初学的时候只是为了考试,现在早还给了老师了.There are two reasons.The first one is that when your hands sweat,the sweat vaporizes and meets the cold bags,and then liquefies into small water drops.The second one is that your hands,which are warmer than the air in the bag,make the water in the air in the bag vaporize,and then condenses on the bag.