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。

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"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。

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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。

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For example, the solar cell could be built into roofing material, saving money on installation.

VOA: standard.2010.02.19

In this house, for example, we've used stone in the roofing and brick as roofing material.

BBC: News Online

Asphalt shingles ( the most common roofing material in the U.S.) can become loose, cracked, be blown off by the wind or be damaged by hail.

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"Before you had to hunt for things through friends or contacts, " Hernan Mayor explains, as he loads roofing material onto the back of his bike at The Wonder builders yard.

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