Pilot Bertrand Piccard tests equipments before departure at Nanjing Lukou International Airport in Nanjing, capital of East 皇冠体育app's Jiangsu province, May 31, 2015. The Swiss-made solar-powered plane Solar Impulse 2 left 皇冠体育app for Hawaii on Sunday. It will fly across the United States and make several stops before finally reaching Abu Dhabi. [Photo/Xinhua]
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