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.

youdao

本文试图通过建立双竖井隧道的活塞风计算公式，以解决双竖井隧道空气阻力计算的困难。

This paper attempts to establish a calculating formula of piston wind velocity in tunnel with double shafts to solve this problem.

youdao

本文试图通过建立双竖井隧道的活塞风计算公式，以解决双竖井隧道空气阻力计算的困难。

This paper attempts to establish a calculating formula of piston wind velocity in tunnel with double shafts to solve this problem.

youdao