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"Eagle Two" made by Lodz University of Technology from Poland prepares to race at the time trial for the 2017 World Solar Challenge in Darwin, Australia, on Oct. 7, 2017. (Xinhua/Xu Haijing)

"Eagle Two" made by Lodz University of Technology from Poland prepares to race at the time trial for the 2017 World Solar Challenge in Darwin, Australia, on Oct. 7, 2017. (Xinhua/Xu Haijing)