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。
Always give this re-connection with your children and yourself first priority on reentry.
永远把和你的孩子，和你自己这样的交流当做回家后的第一要事。
The spacecraft made a successful reentry into the earth's atmosphere.
太空船成功地重返地球大气层。
In this paper, we study the flight paths and footprints of reentry warheads.
本文主要研究了再入弹头的飞行轨迹和终迹圈。
In this paper, we study the flight paths and footprints of reentry warheads.
本文主要研究了再入弹头的飞行轨迹和终迹圈。
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