Thai Prime Minister Prayut Chan-o-cha (3rd L) and Wang Xiaotao (2nd L), deputy director of the National Development and Reform Commission of China, attend the inauguration ceremony of Thailand's first high-speed railway in Pak Chong, Thailand, Dec. 21, 2017. Thailand and China jointly inaugurated the construction of Thailand's first high-speed railway from Bangkok to northeastern province of Nakhon Ratchasima on Thursday. (Xinhua/Li Mangmang)