由于国际空间站距离地面只有220英里，且位于卫星相撞轨道下方271英里处，因此主碎片云进入国际空间站的机率很小。

The space station is in no danger of entering the main debris clouds because it is orbiting just 220 miles above Earth, or 271 miles below the orbit of the collision.

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美国宇航局初步估计此次事故碎片在空间站与人造卫星发上相撞的机率“很小”，但以后相撞的机率会“增加”。

NASA's initial estimate is that the space station faces a "very small" but "elevated" risk of being struck.

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试验，结果，样本空间，事件，机率，机率公理。

Experiments, Outcomes, Sample Spaces, Events, Probability, Axioms of Probability.

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