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。

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"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。

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"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。

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That lack of friction, combined with extraordinary sideways grip, means an iceboat can sail six times the speed of the wind.

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