Workers check the construction quality at the Mezhan tunnel of the Weining-Weizhang expressway in Weining, southwest China's Guizhou Province, July 15, 2020. The Mezhan tunnel of the Weining-Weizhang expressway, located in Mezhan Town of Weining County, was dug through on Wednesday, as construction of the 28 km-long expressway, with a designed speed of 80 kph, has proceeded smoothly. (Xinhua/Liu Xu)
