Thejourneytothemoonhadbeenthefirststeptowardfutureexplo...
問題詳情:Thejourneytothemoonhadbeenthefirststeptowardfutureexploration(探險)inspace.ThedistancebetweentheMoonandEarthisveryshortindeedwhencomparedwiththedistancesbetweenEarthandtheotherplanets.Mars,the...