The overlapping design of the installed shingles provides a double layer of protection as the water flows down the roof slope to the roof edge.
沥青瓦安装的叠层设计在水从屋顶坡面流到屋檐的过程中提供了双重保护层。
Based on the original configuration, double layer holding furnace is manufactured to take effect on energy saving and environmental protection.
可在原配置的情况，制造成双层保温炉，更能够达到节能、环保的作用。
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