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A worker is seen at a tractor assembly line of a company in Weifang, east China's Shandong Province, June 2, 2017. China's gross domestic product expanded 6.9 percent year on year in the first half of the year to about 38.15 trillion yuan (5.62 trillion U.S. dollars), data from the National Bureau of Statistics (NBS) showed Monday. (Xinhua/Guo Xulei)