The best ground-based sites have a wind-power density of about a kilometer per square meter of area swept.
最棒的地面站风能密度约为一公里/平方米扫风面积。
And snow pressures on the ground and the coverings of greenhouses are calculated by mean density of snow in an area and new density of snow respectively.
并且为了提供更多的数据参考，本文采用各地区平均积雪密度和新雪密度分别计算出地面雪压和屋面雪压。
To bring a new medium density development out of the ground today costs 25% to 30% more than the market will pay.
为了实现一个新的中密度开发出地面今天成本25 ％至30 ％以上的市场将支付。
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