Photo taken on Aug. 1, 2017 shows the tunnel boring machine (TBM) "Caiyun" in Kunming, capital of southwest China's Yunnan Province. The Chinese made TBM, which has a 9.03-meter cutter head, was completed in Kunming on Tuesday and it will be used to drill a railway tunnel in the province. (Xinhua/Jing Huihui)
