Recently，asolarpowered（太陽能動力的）planetooktotheskyforthefi...
問題詳情：Recently，asolarpowered（太陽能動力的）planetooktotheskyforthefirsttime.Ithadpassedanimportanttestonthewaytotravelaroundtheworld.TheplanetookofffromanairportinSwitzerland（瑞士）at45kmanhour.Itslowlyros...