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BB-8的工作原理是什么？

http://howbb8works.com/

http://www.sciencefocus.com/article/gadgets/how-it-works-bb-8

http://makezine.com/2015/09/03/hands-on-with-spheros-star-wars-bb-8-toy/

http://www.instructables.com/id/DIY-Life-Size-Phone-Controlled-BB8-Droid/