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(BBC News)The world's largest unmanned plane has been unveiled in Australia.
（英國國家廣播公司報道）世界上最大的無人駕駛飛機首度在澳洲亮相。
It is shaped like a bird and soars like one, too.
這架飛機造型像只鳥，凌空的氣勢也可與鳥比擬。
It was designed by NASA and will be used to carry out surveillance.
這架飛機是由美國太空總署所設計，以后將會被用來執行監視的工作。
The plane will patrol Australia's coastline.
未來這架飛機的任務是巡邏澳洲海岸線。
