They presented a series of alternatives to Constellation that would send humans to different destinations and use different rockets.
他们提出了一套方案以替代星座计划，即根据载人飞行目的地的不同而使用不同的火箭。
They presented a series of alternatives to Constellation that would send humans to different destinations and use different rockets.
他们提出了一套方案以替代星座计划，即根据载人飞行目的地的不同而使用不同的火箭。
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