These are actually serious-if audacious-ideas for launch systems, both of which have been bouncing around since the start of the Space Age.

  • 这两个想法其实真的是严肃的——即使有点太野心勃勃——发射计划,而且自从太空时代开启以来,人们就一直在琢磨怎么付诸实践。

  • 互联网摘选 2025-01-20 13:29:05

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