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"Stichting Zenith Innovation" of the Netherlands prepares their solar car "Nuna9" for the time trial of the 2017 World Solar Challenge in Darwin, Australia, on Oct. 7, 2017. (Xinhua/Xu Haijing)
"Stichting Zenith Innovation" of the Netherlands prepares their solar car "Nuna9" for the time trial of the 2017 World Solar Challenge in Darwin, Australia, on Oct. 7, 2017. (Xinhua/Xu Haijing)