Alternatively the air could be fed to a fuel cell to generate electricity to spin the blades.

另外，为了产生电力以供叶片旋转，空气能为燃料电池供氧。

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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。

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Sometimes that means giving it a spin in the air so that when the flash goes off, you get a nice effect.

有时候这会意味着使他在空中转一圈好让在闪光灯开启的一瞬间，能有个漂亮的效果。

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Tangential entries cause the warm moist air to spin as it rises forming an anchored convective vortex.

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Any breeze would spin the trubine and draw air out of the natural cave and through the house.

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All that was needed to make a mechanical energy-storage system was a good enough rotational seal, so the flywheel could spin freely inside a vacuum chamber with no air resistance.

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