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　　A bullet train drives in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, April 1, 2017. China has built one of the world's most extensive high-speed rail networks in just a few years. It has the world's longest high-speed rail network, 22,000 km as of the end of 2016, or 60 percent of the world's total, and the mileage will increase to 45,000 km by 2030. Guangxi joined the networks of high-speed rail in 2013. (Xinhua/Huang Xiaobang)