It generates small particles with random size and velocity and lets them fall onto the surface where they settle, increasing surface height in the place a bit.
它产生随机大小和速度的小粒子，让它们落到图像表面上，使图像产生表面高度小小渐增的效果。
2
And even if the supply of money were increased, its velocity of circulation might fall, leaving spending unaffected.
而且，就算是货币的供给增加了，但是货币的流通速度可能会降低，带来的结果是消费不会受到影响。
3
The falling object, after traveling a certain distance through the air reaches a final speed, or "terminal velocity," because the object's friction with the air slows the fall.