从这个公式中可以看出，当v接近于c时，更进一步加速所产生的阻力变得无限大-所以c是极限速度。

From this we see that the resistance to further acceleration becomes infinite when v approaches c-hence cis the ultimate speed.

youdao

So I just want to use that again and again, starting from that, for various different sorts of conditions andderive the criterion for equilibrium in each set of conditions.

所以我将会一遍又一遍地使用这个公式，从这个公式出发，在各种条件了,推导出,任意条件下的平衡条件。

麻省理工公开课 - 热力学与动力学课程节选