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Liu Yongtan (R, front) studies radar technology at a laboratory of Harbin Institute of Technology in Harbin, capital of northeast China's Heilongjiang Province, Dec. 25, 2018. (Xinhua/Wang Song)
Liu Yongtan (R, front) studies radar technology at a laboratory of Harbin Institute of Technology in Harbin, capital of northeast China's Heilongjiang Province, Dec. 25, 2018. (Xinhua/Wang Song)