Long before air-conditioning, people around the world came up with ingenious ways to beat the heat. But, really — wear dark, billowing robes? And drink tea? 空调问世之前很久，世界各地的人们就想出了各种巧妙的方法来防暑降温。不过，真的吗？穿深色的宽松长袍？还有喝茶？ The science can be surprising. As big chunks…