Other indicators, such as sales of roofing material, point to busier economic activity.
其他的指标，例如屋顶建材的销售，也指向更繁忙的经济活动。
"Imagine carrying a roll of flexible product on the roof and unrolling it," he says. "Workers are already used to unrolling roofing material."
想象一下，带着一卷可卷曲的产品上屋顶，然后把它展开——工人们已经习惯了展开屋顶的材料了。
The plane's steel structure was used for load-bearing walls, while the light-weight aluminum shell and wings were reappropriated as roofing material and exterior walls.
飞机的钢结构被用作承重墙，而轻量级的铝外壳和飞机翅膀则被回收利用成屋顶材料和外墙。
For example, roof material must be strong enough to withstand damage by the sun, rain, snow, and winds. OFDA-supplied plastic sheeting has been very effective as roofing material.
例如，用于建造屋顶的材料必须足够牢固，以经受住日晒、雨淋、大雪和刮风的考验。美国对外灾难援助办公室提供的塑料薄膜用于建造屋顶已经被证明是非常有效的。
For example, roof material must be strong enough to withstand damage by the sun, rain, snow, and winds. OFDA-supplied plastic sheeting has been very effective as roofing material.
例如，用于建造屋顶的材料必须足够牢固，以经受住日晒、雨淋、大雪和刮风的考验。美国对外灾难援助办公室提供的塑料薄膜用于建造屋顶已经被证明是非常有效的。
应用推荐