And rarely, if we have ever been able to pinpoint exactly where they came from and always finding out that they didn't pose us any hazard.
And rarely, if we have ever been able to pinpoint exactly where they came from and always finding out that they didn't pose us any hazard.
如果我们能够准确地找出这些碎片的来源，并能确认它们(对飞船)不会构成威胁的话，当然这种可能微乎其微。