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...