McDonald's has been using double-walled paper cups--which have a small pocket of air between them to increase insulation--at about 2, 000 restaurants along the West Coast since 2012.
麦当劳从2012年起在美国西海岸的约2，000家餐厅使用双层纸杯，两层之间有空隙可容纳空气从而增强隔热效果。
McDonald's has been using double-walled paper cups--which have a small pocket of air between them to increase insulation--at about 2, 000 restaurants along the West Coast since 2012.
麦当劳从2012年起在美国西海岸的约2，000家餐厅使用双层纸杯，两层之间有空隙可容纳空气从而增强隔热效果。
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