Workers construct at a railway linking Golmud, a city in northwest China's Qinghai Province and Dunhuang in northwest China's Gansu Province, in Gansu, April 16, 2018. China's GDP reached 19.88 trillion yuan (about 3.2 trillion U.S. dollars) in the first three months of 2018, up 6.8 percent year on year at comparable prices, according to the National Bureau of Statistics (NBS). (Xinhua/Gao Hongshan)