完成了不同植被盖度地表的空气动力学特征参数与风蚀量的测试。
The measure and evaluation are carried out on aerodynamics characteristic parameters of different vegetation coverage lands and amount of wind erosion.
为了定量描述北京城市下垫面的空气动力学特征，为模式提供准确的下垫面参数。
Quantified understanding of aerodynamic parameters in urban areas is of great importance in the model study.
新板的足球，与以往往的足球有所不同，其表皮不是由14块组成，而是8块组成，因而此种表皮的足球，其粘合处的凸脊具有特殊的空气动力学特征。
The new model is made out of eight panels, compared with the previous 14, and has special aerodynamic ridges on its surface.
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