Why is space junk considered a problem?
为什么太空垃圾被认为是一个问题？
Many scientists are also suggesting different ways to clean up space junk.
许多科学家也提出了清理太空垃圾的不同方法。
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。
If some break or collide with space junk, others can take their place.
如果其中有些损坏，或是撞上了太空垃圾，还有其他的可以代替。
Nasa engineer Creon Levit said it was imperative that something was done about space junk.
美国宇航局工程师克里昂？莱维特表示，处理太空垃圾迫在眉睫。
太空垃圾极其危险。
太空垃圾极其危险。
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