To imitate the moist air of a cloud, Schaefer would breathe into the machine.Then he would drop into the freezer a bit of powder, sugar, or some other substance.

• 为了模仿云中的潮湿气体，谢弗往机器里呼气，然后往冷冻机里面投入一点粉剂、糖或一些其他物质。