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Denis Flandre, professor at the Belgium's University of Louvain (UCL) engineering school, receives an interview with Xinhua at UCL near Brussels, Belgium, June 12, 2019. (Xinhua/Zhang Cheng)

Denis Flandre, professor at the Belgium's University of Louvain (UCL) engineering school, receives an interview with Xinhua at UCL near Brussels, Belgium, June 12, 2019. (Xinhua/Zhang Cheng)