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。
The basic measure to protect from large area pollutant flashover is to increase overall external insulation level for transmission and substation equipment.
防治电网大面积污闪的根本出路是提高输变电设备外绝缘的总体水平。
The Insulation level between poles and enclosure is important for high voltage shunt capacitors to increase the operation reliability.
高压并联电容器极对壳绝缘水平是保证其在电网安全运行的重要参数。
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