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(BBC News)The world's largest unmanned plane has been unveiled in Australia.
（英国国家广播公司报道）世界上最大的无人驾驶飞机首度在澳洲亮相。
It is shaped like a bird and soars like one, too.
这架飞机造型像只鸟，凌空的气势也可与鸟比拟。
It was designed by NASA and will be used to carry out surveillance.
这架飞机是由美国太空总署所设计，以后将会被用来执行监视的工作。
The plane will patrol Australia's coastline.
未来这架飞机的任务是巡逻澳洲海岸线。
