air drag

基本解释

Even if you remove gravity then there is friction, there's air drag.
即使没有重力,摩擦和空气阻力也会起到这个作用。
Now comes my last part, and that is, how does air drag influence trajectories?
现在是最后一部分，就是，空气阻力如何影响轨道？
Of course, in reality, the baseball player knows better They give effect to the ball, they deal with air drag they spin the ball, and then these equations are not valid.
当然，还是棒球选手更了解现实情况,他们用特殊的抛球方式减小空气阻力,他们使球在飞行时带自转，这些公式就无法应用了。

This low, air resistance creates drag, so the station is constantly slowing down and losing altitude—at the rate of about two miles of altitude every month.
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Since He is much less dense that air (He has only 14% of the density of air) the drag and flutter of the platters in the drives is reduced.
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There are so few air particles to create drag that a slow rotation can quickly accelerate into an uncontrollable spin.
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