以下为句子列表：
英文: A medium-thick shelterbelt can reduce wind velocity by more than 10 percent to a distance of 20 times the tree height on the leeward side and three times the height to the windward.
中文: 中等厚度的防风林在背风侧可在20倍于树高的距离而在迎风侧则在3倍于树高的距离上减小风速10%以上。
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英文: A three-dimensional numerical simulation is used to predict the exhaust gas diffusion from a tunnel portal under different wind velocity and direction.
中文: 摘要采用三维数值模拟的方法，对隧道峒口废气的扩散情况进行了预测和分析，揭示了在不同风速和风向条件下，峒口废气的扩散特征。
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英文: The results show that the higher the wind velocity is, the faster the concentration of the pollutants will attenuate after the pollutants leave the tunnel portal; while the transversal wind will result in the higher concentration of pollutants in a large
中文: 计算结果表明，风速越高，废气离开峒口后，浓度衰减得越快；而横向风则会导致隧道两侧很大区域内的污染物浓度超标。
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