He found that some droplets had a certain velocity, and then others had a velocity plus some step.

他发现了一些液滴存在某个速度，还有其他的液滴有速度和位移。

麻省理工公开课 - 固态化学导论课程节选

But basketball, I just find that how quickly they go across the floor,

但看篮球时，我会发现他们穿越球场的速度飞快，

现场观看篮球赛 - SpeakingMax英语口语达人

You will find that objects that are at constant initial velocity maintain the velocity.

你也会发现原本匀速的物体,依然保持原来的速度

耶鲁公开课 - 基础物理课程节选

take the derivative of this, get the velocity vector and you notice his magnitude is a constant Whichever way you do it, you can then rewrite this as v square over r.

对这个式子求一次导,就能得到速度矢量,你会发现其模长是常数,不管用什么方法,加速度也可以写成 v^2 / r

耶鲁公开课 - 基础物理课程节选