In clouds, there is a higher probability of light scattering forward.
在云中，有一种高概率的向前散射光线。这是叫散射的各向异性。
The collision probability between spacecraft and debris clouds are studied. Different kinds of collision probabilities are mentioned, and methods to convert these probabilities are described.
讨论了航天器与碎片云碰撞概率的提法，介绍了不同碰撞概率间的转换方法。
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