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这是2020年,月球登陆器“牵牛星”号刚刚抵达月球。4名航天员将开始建设第一个月球基地。打开这个大折页,来瞧瞧下次人
This is 2020, the moon lander “Altair ” has just arrived on the moon. Four astronauts will start building the first moon base. Open this big page to see the next time