adj. collisionless
空间中等离子体是无碰撞的。
路径规划也是一个很复杂的问题，不仅要寻求一条无碰撞的最短路径，而且还要求该路径尽可能平滑并满足一定的安全性。
Path planning also a complex problem that not only guarantees a collision-free path with minimum traveling distance but also requires smoothness and clearances.
该文对无滑斜碰撞的研究引入了切向系数。
The tangential coefficient for non-sliding oblique collision is introduced.
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