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Recently,asolarpowered(太阳能动力的)planetooktotheskyforthefi...
问题详情:Recently,asolarpowered(太阳能动力的)planetooktotheskyforthefirsttime.Ithadpassedanimportanttestonthewaytotravelaroundtheworld.TheplanetookofffromanairportinSwitzerland(瑞士)at45kmanhour.Itslowlyros...