The solar-powered airplane Solar Impulse 2 arrives in Nanjing on Tuesday night, April 21, 2015, after 17 hours of flying. (Photo/CRIENGLISH.com)
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The solar-powered airplane Solar Impulse 2 arrives in Nanjing on Tuesday night, April 21, 2015, after 17 hours of flying. (Photo/CRIENGLISH.com)