据合理估计，你得到一个弹性碰撞，但空气阻力总存在。
And so to a reasonable approximation, you will get an elastic collision, but, of course, there's always air drag.
在形成该星云团的碰撞过程中，大多数恒星彼此分离并且快速向前运动，几乎未受任何阻力。
In the collision that formed it, the stars mostly missed each other and went speeding ahead, relatively unimpeded.
织物循环运行速度，染液速度总是超越织物运行速度，然后产生了染色的优越碰撞反向阻力的物理性能。
Cycle traveling speed of fabrics and dye liquor speed are always faster than fabric's traveling speed. so effective collision and reverse resistance? Force are generated during dyeing.
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