This friction tends to slow the speed of winds, making them far less efficient at dispersing pollutants.

这种摩擦往往会减慢风的速度，使它们吹散污染物的效率大大降低。

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The falling object, after traveling a certain distance through the air reaches a final speed, or "terminal velocity," because the object's friction with the air slows the fall.

物体在下落一定距离后由于空气阻力都会达到一个终极速度。

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For tapered roller large end and sliding friction between the inner wall, the speed limit is often lower than the same size cylindrical roller bearings.

因圆锥滚子大端与内圈挡边之间滑动摩擦，其极限转速往往低于同尺寸的圆柱滚子轴承。

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Surprisingly, in the eighteenth century, horologists were already using air friction to regulate the speed of minute repeaters.

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Once dominant, these New Economy locomotives could run with negative friction, always picking up speed like some superconducting profit phenomenon.

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Taking this traditional idea of using air friction and refining it to control the speed of automatic winding, Urwerk has replaced the traditional rotating mechanisms of the past with miniature twin turbines that can be seen spinning on the back of the watch and are connected to the rotor.

FORBES: Jackie Chan, Kwon Sang-Woo and Urwerk Star in Chinese Zodiac