不仅如此，白色的屋顶除了能让电费帐单大大降低，相比于黑色的屋顶，它们的制造费用仅仅多出15个百分点，还要视具体使用的材料而定。
What is more, a white roof can cost as little as 15 percent more than its dark counterpart, depending on the materials used, while slashing electricity bills.
不仅如此，白色的屋顶除了能让电费帐单大大降低，相比于黑色的屋顶，它们的制造费用仅仅多出15个百分点，还要视具体使用的材料而定。
What is more, a white roof can cost as little as 15 percent more than its dark counterpart, depending on the materials used, while slashing electricity bills.
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