Although those cities have cold winters, they are heat islands in the summer, with hundreds of thousands of square feet of roof surface absorbing energy.
尽管那些城市有寒冷的冬季，到了夏季，这些城市就是热岛，有数十万平方英尺的屋顶在吸收热量。
The roof surface itself is covered in grass with walking paths that are designed to also function as emergency escape routes.
屋顶表面自身是被草坪覆盖的，草坪中的步行小径同时还具有紧急疏散路线的功能。
The comparison between wind action only on the upper roof surface and both on the upper and lower roof surfaces, shows that the latter condition is more advantageous.
比较了仅考虑上表面风荷载作用和同时考虑上下表面风荷载作用对结构的影响，结果显示前一种情况对结构更为不利。
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