Now drag is proportional to cross sectional area, so it scales with radius squared, whereas weight scales with radius cubed.

现在阻力与横截面积成正比，因此它与半径的平方成比例，而重量与半径的立方成比例。

In the end, both groups had significant yet similar increases in leg lean mass, quad muscle fiber cross sectional area, and their leg-press 1 rep maxes.

最后，两组在腿部肌肉质量、四肌纤维横截面积和腿部最大压力按压次数方面都有显著但相似的增加。

One of the curious things about air resistance is that it depends not only on the cross sectional area of the object, but also on its overall shape.

关于空气阻力的有趣之处之一是， 它不仅取决于物体的横截面积，还取决于其整体形状。

This works since if the jumper is scaled up ten times on all sides the cross sectional area increases by a hundred, which increases the drag force but the jumper's mass increases by a thousand.

- 这是有效的， 因为如果跳线的所有侧面都按比例放大十倍， 则横截面积会增加一百倍，这会增加阻力， 但跳线的质量会增加一千倍。