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In this case, the concept of the probability space has to be extended.
在这种情况下，概率空间的概念必须扩展。
youdao
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Pf : Probability that a piece of space junk will survive reentry.
Pf：指一块太空垃圾坠落到地球表面的概率。
youdao
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Pf : Probability that a piece of space junk will survive reentry.
Pf：指一块太空垃圾坠落到地球表面的概率。
youdao