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。

youdao

"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。

youdao

"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。

youdao

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

FORBES: Magazine Article

Without standing, he lifts his left foot and drags a brittle friction match across the sole of his boot, then watches the red tip flare and expire in the chill wind before he can transfer the flame.

NPR: Excerpt: 'Woodsburner'