- 问题详情:Manhasbeentothemoon.Ithasbeenthefirststeptowardsfutureexplorationinspace.WhencomparedwiththedistancesbetweenEarthandtheotherplanets,thedistancebetweentheMoonandEarthisveryshortindeed.Mars,thenearestplanettoEarthismillionsofmilesaway!Traveling...
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