Thejourneytothemoonhadbeenthefirststeptowardfutureexplo...
问题详情：Thejourneytothemoonhadbeenthefirststeptowardfutureexploration(探险)inspace.ThedistancebetweentheMoonandEarthisveryshortindeedwhencomparedwiththedistancesbetweenEarthandtheotherplanets.Mars,the...