Wind movements are also modified in cities because buildings increase the friction on air flowing around them.
风向在城市里也会改变，因为建筑物增加了它们周围流动的空气的摩擦力。
"It describes the power needed to propel a bike against our everyday foes: gravity, weight, friction, wind resistance," he writes.
“它描述了推动自行车克服日常阻力——如引力、重量、摩擦力以及风阻——所需要的能量，”他这样写到。
The model of system loss model caused by wind resistance and bearing friction is established based on the regression analysis of flywheel's free brake curve.
通过对飞轮的自由刹车曲线进行回归分析，得出由风阻和轴承磨损等引起的系统损耗模型。
"Our system is very efficient in that there is no friction loss associated with more mechanical systems such as conventional wind turbines," he said.
我们的系统在输出方面效率很高，力学系统比如传统的风力涡轮机不会造成磨擦力损耗。
Both the ratio of friction velocity to free stream wind velocity and the thickness of airflow are subject to the sidewall effect, showing the increase trend with the decreasing aspect ratios.
随着风洞宽高比的减小，断面内中垂线上的气流摩阻速度与自由流速的比值以及受风洞边壁影响的气流厚度均增大。
Both the ratio of friction velocity to free stream wind velocity and the thickness of airflow are subject to the sidewall effect, showing the increase trend with the decreasing aspect ratios.
随着风洞宽高比的减小，断面内中垂线上的气流摩阻速度与自由流速的比值以及受风洞边壁影响的气流厚度均增大。
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