You can either throw the ball or you can run the ball. Those are only two ways.

你要么扔球，要么带着球跑。就这两种方式。

美式足球 - SpeakingMax英语口语达人

So, therefore, we can rewrite our equation in two ways. One is just talking about it in terms only of energy where our kinetic energy here is going to be equal to the total energy going in -- the energy initial minus this energy of the work function here.

所以我们可以把方程,写成两种形式，一个是,只考虑能量，动能等于总的,入射能量-初始能量减去,功函数的能量，我们如果想解决,比方说，我们想知道。

麻省理工公开课 - 化学原理课程节选

And there are only two ways to move the ball in football and to gain yards.

而且在美式足球比赛中，只有两种方式去推进球来获得码数。

美式足球 - SpeakingMax英语口语达人