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Inthefuture,peoplemaytraveltoMars(火星)bywater-poweredspa...
问题详情:Inthefuture,peoplemaytraveltoMars(火星)bywater-poweredspaceship!Today'sspaceshipsarefineforgettingthingsintospace,buttheyarenotsogoodattravellinglongdistances.Thesespaceshipsburnchemicalfuels...