为了减小空气阻力，列车车厢气动外形的研究变得愈加重要。
To decrease aerodynamic drag, it is important to improve aerodynamic contour of train.
次要结构由机翼前缘，后缘和翼尖构成，主要用来减小空气阻力，支撑蒙皮，协助飞行操纵面和操纵机构。
The secondary structures, which support aerodynamic fairings or skins, flight control surfaces and control mechanisms, consist of the leading edge, trailing edge, and wingtip.
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。
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.
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