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。
because you need to know like, how fast the shutter speed and all that stuff,
因为你必须知道,像快门的速度,还有其他这一类东西,
You shoot something, you should know when it will land, where it will land, with what speed it will land, how high it will go.
抛出一个物体,我们要知道落地时间,落地位置,还有落地的速度,最高点的高度
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